diff --git a/packages/twenty-server/src/engine/metadata-modules/data-source/data-source.exception.ts b/packages/twenty-server/src/engine/metadata-modules/data-source/data-source.exception.ts
new file mode 100644
index 000000000..89672fa26
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/data-source/data-source.exception.ts
@@ -0,0 +1,11 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class DataSourceException extends CustomException {
+  constructor(message: string, code: DataSourceExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum DataSourceExceptionCode {
+  DATA_SOURCE_NOT_FOUND = 'DATA_SOURCE_NOT_FOUND',
+}
diff --git a/packages/twenty-server/src/engine/metadata-modules/data-source/data-source.service.ts b/packages/twenty-server/src/engine/metadata-modules/data-source/data-source.service.ts
index 6e6f46a4c..6ca6eb83b 100644
--- a/packages/twenty-server/src/engine/metadata-modules/data-source/data-source.service.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/data-source/data-source.service.ts
@@ -3,6 +3,11 @@ import { InjectRepository } from '@nestjs/typeorm';
 
 import { FindManyOptions, Repository } from 'typeorm';
 
+import {
+  DataSourceException,
+  DataSourceExceptionCode,
+} from 'src/engine/metadata-modules/data-source/data-source.exception';
+
 import { DataSourceEntity } from './data-source.entity';
 
 @Injectable()
@@ -58,10 +63,17 @@ export class DataSourceService {
   async getLastDataSourceMetadataFromWorkspaceIdOrFail(
     workspaceId: string,
   ): Promise<DataSourceEntity> {
-    return this.dataSourceMetadataRepository.findOneOrFail({
-      where: { workspaceId },
-      order: { createdAt: 'DESC' },
-    });
+    try {
+      return this.dataSourceMetadataRepository.findOneOrFail({
+        where: { workspaceId },
+        order: { createdAt: 'DESC' },
+      });
+    } catch (error) {
+      throw new DataSourceException(
+        `Data source not found for workspace ${workspaceId}: ${error}`,
+        DataSourceExceptionCode.DATA_SOURCE_NOT_FOUND,
+      );
+    }
   }
 
   async delete(workspaceId: string): Promise<void> {
diff --git a/packages/twenty-server/src/engine/metadata-modules/errors/InvalidStringException.ts b/packages/twenty-server/src/engine/metadata-modules/errors/InvalidStringException.ts
deleted file mode 100644
index eabfb0140..000000000
--- a/packages/twenty-server/src/engine/metadata-modules/errors/InvalidStringException.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-import { BadRequestException } from '@nestjs/common';
-
-export class InvalidStringException extends BadRequestException {
-  constructor(string: string) {
-    const message = `String "${string}" is not valid`;
-
-    super(message);
-  }
-}
diff --git a/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.exception.ts b/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.exception.ts
new file mode 100644
index 000000000..e9390c099
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.exception.ts
@@ -0,0 +1,17 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class FieldMetadataException extends CustomException {
+  code: FieldMetadataExceptionCode;
+  constructor(message: string, code: FieldMetadataExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum FieldMetadataExceptionCode {
+  FIELD_METADATA_NOT_FOUND = 'FIELD_METADATA_NOT_FOUND',
+  INVALID_FIELD_INPUT = 'INVALID_FIELD_INPUT',
+  FIELD_MUTATION_NOT_ALLOWED = 'FIELD_MUTATION_NOT_ALLOWED',
+  FIELD_ALREADY_EXISTS = 'FIELD_ALREADY_EXISTS',
+  OBJECT_METADATA_NOT_FOUND = 'OBJECT_METADATA_NOT_FOUND',
+  INTERNAL_SERVER_ERROR = 'INTERNAL_SERVER_ERROR',
+}
diff --git a/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.resolver.ts b/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.resolver.ts
index b4bc92e00..8e3c63208 100644
--- a/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.resolver.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.resolver.ts
@@ -23,6 +23,7 @@ import { RelationDefinitionDTO } from 'src/engine/metadata-modules/field-metadat
 import { UpdateOneFieldMetadataInput } from 'src/engine/metadata-modules/field-metadata/dtos/update-field.input';
 import { FieldMetadataType } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
 import { FieldMetadataService } from 'src/engine/metadata-modules/field-metadata/field-metadata.service';
+import { fieldMetadataGraphqlApiExceptionHandler } from 'src/engine/metadata-modules/field-metadata/utils/field-metadata-graphql-api-exception-handler.util';
 
 @UseGuards(JwtAuthGuard)
 @Resolver(() => FieldMetadataDTO)
@@ -34,10 +35,14 @@ export class FieldMetadataResolver {
     @Args('input') input: CreateOneFieldMetadataInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.fieldMetadataService.createOne({
-      ...input.field,
-      workspaceId,
-    });
+    try {
+      return this.fieldMetadataService.createOne({
+        ...input.field,
+        workspaceId,
+      });
+    } catch (error) {
+      fieldMetadataGraphqlApiExceptionHandler(error);
+    }
   }
 
   @Mutation(() => FieldMetadataDTO)
@@ -45,10 +50,14 @@ export class FieldMetadataResolver {
     @Args('input') input: UpdateOneFieldMetadataInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.fieldMetadataService.updateOne(input.id, {
-      ...input.update,
-      workspaceId,
-    });
+    try {
+      return this.fieldMetadataService.updateOne(input.id, {
+        ...input.update,
+        workspaceId,
+      });
+    } catch (error) {
+      fieldMetadataGraphqlApiExceptionHandler(error);
+    }
   }
 
   @Mutation(() => FieldMetadataDTO)
@@ -85,27 +94,32 @@ export class FieldMetadataResolver {
       );
     }
 
-    return this.fieldMetadataService.deleteOneField(input, workspaceId);
+    try {
+      return this.fieldMetadataService.deleteOneField(input, workspaceId);
+    } catch (error) {
+      fieldMetadataGraphqlApiExceptionHandler(error);
+    }
   }
 
   @ResolveField(() => RelationDefinitionDTO, { nullable: true })
   async relationDefinition(
     @Parent() fieldMetadata: FieldMetadataDTO,
     @Context() context: { loaders: IDataloaders },
-  ): Promise<RelationDefinitionDTO | null> {
+  ): Promise<RelationDefinitionDTO | null | undefined> {
     if (fieldMetadata.type !== FieldMetadataType.RELATION) {
       return null;
     }
 
-    const relationMetadataItem =
-      await context.loaders.relationMetadataLoader.load(fieldMetadata.id);
+    try {
+      const relationMetadataItem =
+        await context.loaders.relationMetadataLoader.load(fieldMetadata.id);
 
-    const relationDefinition =
-      await this.fieldMetadataService.getRelationDefinitionFromRelationMetadata(
+      return this.fieldMetadataService.getRelationDefinitionFromRelationMetadata(
         fieldMetadata,
         relationMetadataItem,
       );
-
-    return relationDefinition;
+    } catch (error) {
+      fieldMetadataGraphqlApiExceptionHandler(error);
+    }
   }
 }
diff --git a/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.service.ts b/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.service.ts
index 8098b4f26..1c7a31588 100644
--- a/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.service.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.service.ts
@@ -1,9 +1,4 @@
-import {
-  BadRequestException,
-  ConflictException,
-  Injectable,
-  NotFoundException,
-} from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
 import { InjectDataSource, InjectRepository } from '@nestjs/typeorm';
 
 import { v4 as uuidV4 } from 'uuid';
@@ -39,9 +34,15 @@ import {
 import { DeleteOneFieldInput } from 'src/engine/metadata-modules/field-metadata/dtos/delete-field.input';
 import { computeColumnName } from 'src/engine/metadata-modules/field-metadata/utils/compute-column-name.util';
 import { assertMutationNotOnRemoteObject } from 'src/engine/metadata-modules/object-metadata/utils/assert-mutation-not-on-remote-object.util';
-import { InvalidStringException } from 'src/engine/metadata-modules/errors/InvalidStringException';
-import { validateMetadataName } from 'src/engine/metadata-modules/utils/validate-metadata-name.utils';
+import {
+  validateMetadataName,
+  InvalidStringException,
+} from 'src/engine/metadata-modules/utils/validate-metadata-name.utils';
 import { WorkspaceCacheVersionService } from 'src/engine/metadata-modules/workspace-cache-version/workspace-cache-version.service';
+import {
+  FieldMetadataException,
+  FieldMetadataExceptionCode,
+} from 'src/engine/metadata-modules/field-metadata/field-metadata.exception';
 
 import {
   FieldMetadataEntity,
@@ -94,7 +95,10 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
         );
 
       if (!objectMetadata) {
-        throw new NotFoundException('Object does not exist');
+        throw new FieldMetadataException(
+          'Object metadata does not exist',
+          FieldMetadataExceptionCode.OBJECT_METADATA_NOT_FOUND,
+        );
       }
 
       if (!fieldMetadataInput.isRemoteCreation) {
@@ -107,7 +111,10 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
           !fieldMetadataInput.options &&
           fieldMetadataInput.type !== FieldMetadataType.RATING
         ) {
-          throw new BadRequestException('Options are required for enum fields');
+          throw new FieldMetadataException(
+            'Options are required for enum fields',
+            FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
+          );
         }
       }
 
@@ -127,7 +134,10 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
       });
 
       if (fieldAlreadyExists) {
-        throw new ConflictException('Field already exists');
+        throw new FieldMetadataException(
+          'Field already exists',
+          FieldMetadataExceptionCode.FIELD_ALREADY_EXISTS,
+        );
       }
 
       const createdFieldMetadata = await fieldMetadataRepository.save({
@@ -183,7 +193,10 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
       const workspaceQueryRunner = workspaceDataSource?.createQueryRunner();
 
       if (!workspaceQueryRunner) {
-        throw new Error('Could not create workspace query runner');
+        throw new FieldMetadataException(
+          'Could not create workspace query runner',
+          FieldMetadataExceptionCode.INTERNAL_SERVER_ERROR,
+        );
       }
 
       await workspaceQueryRunner.connect();
@@ -263,7 +276,10 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
       });
 
       if (!existingFieldMetadata) {
-        throw new NotFoundException('Field does not exist');
+        throw new FieldMetadataException(
+          'Field does not exist',
+          FieldMetadataExceptionCode.FIELD_METADATA_NOT_FOUND,
+        );
       }
 
       const objectMetadata =
@@ -277,7 +293,10 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
         );
 
       if (!objectMetadata) {
-        throw new NotFoundException('Object does not exist');
+        throw new FieldMetadataException(
+          'Object metadata does not exist',
+          FieldMetadataExceptionCode.OBJECT_METADATA_NOT_FOUND,
+        );
       }
 
       assertMutationNotOnRemoteObject(objectMetadata);
@@ -287,15 +306,19 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
           existingFieldMetadata.id &&
         fieldMetadataInput.isActive === false
       ) {
-        throw new BadRequestException(
+        throw new FieldMetadataException(
           'Cannot deactivate label identifier field',
+          FieldMetadataExceptionCode.FIELD_MUTATION_NOT_ALLOWED,
         );
       }
 
       if (fieldMetadataInput.options) {
         for (const option of fieldMetadataInput.options) {
           if (!option.id) {
-            throw new BadRequestException('Option id is required');
+            throw new FieldMetadataException(
+              'Option id is required',
+              FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
+            );
           }
         }
       }
@@ -325,10 +348,18 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
               ? updatableFieldInput.defaultValue
               : null,
       });
-      const updatedFieldMetadata = await fieldMetadataRepository.findOneOrFail({
+
+      const updatedFieldMetadata = await fieldMetadataRepository.findOne({
         where: { id },
       });
 
+      if (!updatedFieldMetadata) {
+        throw new FieldMetadataException(
+          'Field does not exist',
+          FieldMetadataExceptionCode.FIELD_METADATA_NOT_FOUND,
+        );
+      }
+
       if (
         fieldMetadataInput.name ||
         updatableFieldInput.options ||
@@ -392,7 +423,10 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
       });
 
       if (!fieldMetadata) {
-        throw new NotFoundException('Field does not exist');
+        throw new FieldMetadataException(
+          'Field does not exist',
+          FieldMetadataExceptionCode.FIELD_METADATA_NOT_FOUND,
+        );
       }
 
       const objectMetadata =
@@ -403,7 +437,10 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
         });
 
       if (!objectMetadata) {
-        throw new NotFoundException('Object does not exist');
+        throw new FieldMetadataException(
+          'Object metadata does not exist',
+          FieldMetadataExceptionCode.OBJECT_METADATA_NOT_FOUND,
+        );
       }
 
       await fieldMetadataRepository.delete(fieldMetadata.id);
@@ -454,7 +491,10 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
     });
 
     if (!fieldMetadata) {
-      throw new NotFoundException('Field does not exist');
+      throw new FieldMetadataException(
+        'Field does not exist',
+        FieldMetadataExceptionCode.FIELD_METADATA_NOT_FOUND,
+      );
     }
 
     return fieldMetadata;
@@ -517,9 +557,12 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
       relationMetadata.relationType === RelationMetadataType.MANY_TO_MANY ||
       relationMetadata.relationType === RelationMetadataType.MANY_TO_ONE
     ) {
-      throw new Error(`
+      throw new FieldMetadataException(
+        `
         Relation type ${relationMetadata.relationType} not supported
-      `);
+      `,
+        FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
+      );
     }
 
     if (isRelationFromSource) {
@@ -561,8 +604,9 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
         validateMetadataName(fieldMetadataInput.name);
       } catch (error) {
         if (error instanceof InvalidStringException) {
-          throw new BadRequestException(
+          throw new FieldMetadataException(
             `Characters used in name "${fieldMetadataInput.name}" are not supported`,
+            FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
           );
         } else {
           throw error;
diff --git a/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/__tests__/serialize-default-value.spec.ts b/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/__tests__/serialize-default-value.spec.ts
index 61e46ec6a..476104f1b 100644
--- a/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/__tests__/serialize-default-value.spec.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/__tests__/serialize-default-value.spec.ts
@@ -1,5 +1,4 @@
-import { BadRequestException } from '@nestjs/common';
-
+import { FieldMetadataException } from 'src/engine/metadata-modules/field-metadata/field-metadata.exception';
 import { serializeDefaultValue } from 'src/engine/metadata-modules/field-metadata/utils/serialize-default-value';
 
 describe('serializeDefaultValue', () => {
@@ -15,8 +14,10 @@ describe('serializeDefaultValue', () => {
     expect(serializeDefaultValue('now')).toBe('now()');
   });
 
-  it('should throw BadRequestException for invalid dynamic default value type', () => {
-    expect(() => serializeDefaultValue('invalid')).toThrow(BadRequestException);
+  it('should throw FieldMetadataException for invalid dynamic default value type', () => {
+    expect(() => serializeDefaultValue('invalid')).toThrow(
+      FieldMetadataException,
+    );
   });
 
   it('should handle string static default value', () => {
diff --git a/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/compute-column-name.util.ts b/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/compute-column-name.util.ts
index c1f358ad4..116eb94f1 100644
--- a/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/compute-column-name.util.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/compute-column-name.util.ts
@@ -4,6 +4,10 @@ import { CompositeProperty } from 'src/engine/metadata-modules/field-metadata/in
 import { FieldMetadataType } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
 import { isCompositeFieldMetadataType } from 'src/engine/metadata-modules/field-metadata/utils/is-composite-field-metadata-type.util';
 import { pascalCase } from 'src/utils/pascal-case';
+import {
+  FieldMetadataException,
+  FieldMetadataExceptionCode,
+} from 'src/engine/metadata-modules/field-metadata/field-metadata.exception';
 
 type ComputeColumnNameOptions = { isForeignKey?: boolean };
 
@@ -29,8 +33,9 @@ export function computeColumnName<T extends FieldMetadataType | 'default'>(
   }
 
   if (isCompositeFieldMetadataType(fieldMetadataOrFieldName.type)) {
-    throw new Error(
-      `Cannot compute column name for composite field metadata type: ${fieldMetadataOrFieldName.type}`,
+    throw new FieldMetadataException(
+      `Cannot compute composite column name for non-composite field metadata type: ${fieldMetadataOrFieldName.type}`,
+      FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
     );
   }
 
@@ -61,8 +66,9 @@ export function computeCompositeColumnName<
   }
 
   if (!isCompositeFieldMetadataType(fieldMetadataOrFieldName.type)) {
-    throw new Error(
+    throw new FieldMetadataException(
       `Cannot compute composite column name for non-composite field metadata type: ${fieldMetadataOrFieldName.type}`,
+      FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
     );
   }
 
diff --git a/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/field-metadata-graphql-api-exception-handler.util.ts b/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/field-metadata-graphql-api-exception-handler.util.ts
new file mode 100644
index 000000000..eeef6e280
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/field-metadata-graphql-api-exception-handler.util.ts
@@ -0,0 +1,32 @@
+import {
+  FieldMetadataException,
+  FieldMetadataExceptionCode,
+} from 'src/engine/metadata-modules/field-metadata/field-metadata.exception';
+import {
+  UserInputError,
+  ForbiddenError,
+  ConflictError,
+  InternalServerError,
+  NotFoundError,
+} from 'src/engine/utils/graphql-errors.util';
+
+export const fieldMetadataGraphqlApiExceptionHandler = (error: Error) => {
+  if (error instanceof FieldMetadataException) {
+    switch (error.code) {
+      case FieldMetadataExceptionCode.FIELD_METADATA_NOT_FOUND:
+        throw new NotFoundError(error.message);
+      case FieldMetadataExceptionCode.INVALID_FIELD_INPUT:
+        throw new UserInputError(error.message);
+      case FieldMetadataExceptionCode.FIELD_MUTATION_NOT_ALLOWED:
+        throw new ForbiddenError(error.message);
+      case FieldMetadataExceptionCode.FIELD_ALREADY_EXISTS:
+        throw new ConflictError(error.message);
+      case FieldMetadataExceptionCode.OBJECT_METADATA_NOT_FOUND:
+      case FieldMetadataExceptionCode.INTERNAL_SERVER_ERROR:
+      default:
+        throw new InternalServerError(error.message);
+    }
+  }
+
+  throw error;
+};
diff --git a/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/serialize-default-value.ts b/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/serialize-default-value.ts
index 2f93da1b8..7445e0fed 100644
--- a/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/serialize-default-value.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/serialize-default-value.ts
@@ -1,7 +1,9 @@
-import { BadRequestException } from '@nestjs/common';
-
 import { FieldMetadataDefaultSerializableValue } from 'src/engine/metadata-modules/field-metadata/interfaces/field-metadata-default-value.interface';
 
+import {
+  FieldMetadataException,
+  FieldMetadataExceptionCode,
+} from 'src/engine/metadata-modules/field-metadata/field-metadata.exception';
 import { isFunctionDefaultValue } from 'src/engine/metadata-modules/field-metadata/utils/is-function-default-value.util';
 import { serializeFunctionDefaultValue } from 'src/engine/metadata-modules/field-metadata/utils/serialize-function-default-value.util';
 
@@ -18,7 +20,10 @@ export const serializeDefaultValue = (
       serializeFunctionDefaultValue(defaultValue);
 
     if (!serializedTypeDefaultValue) {
-      throw new BadRequestException('Invalid default value');
+      throw new FieldMetadataException(
+        'Invalid default value',
+        FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
+      );
     }
 
     return serializedTypeDefaultValue;
@@ -51,5 +56,8 @@ export const serializeDefaultValue = (
     return `'${JSON.stringify(defaultValue)}'`;
   }
 
-  throw new BadRequestException(`Invalid default value "${defaultValue}"`);
+  throw new FieldMetadataException(
+    `Invalid default value "${defaultValue}"`,
+    FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
+  );
 };
diff --git a/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/validate-options-for-type.util.ts b/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/validate-options-for-type.util.ts
index 7e119d594..aecb4eefe 100644
--- a/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/validate-options-for-type.util.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/validate-options-for-type.util.ts
@@ -8,6 +8,10 @@ import {
   FieldMetadataComplexOption,
   FieldMetadataDefaultOption,
 } from 'src/engine/metadata-modules/field-metadata/dtos/options.input';
+import {
+  FieldMetadataException,
+  FieldMetadataExceptionCode,
+} from 'src/engine/metadata-modules/field-metadata/field-metadata.exception';
 
 import { isEnumFieldMetadataType } from './is-enum-field-metadata-type.util';
 
@@ -24,7 +28,10 @@ export const validateOptionsForType = (
   if (options === null) return true;
 
   if (!Array.isArray(options)) {
-    throw new Error('Options must be an array');
+    throw new FieldMetadataException(
+      'Options must be an array',
+      FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
+    );
   }
 
   if (!isEnumFieldMetadataType(type)) {
@@ -39,7 +46,10 @@ export const validateOptionsForType = (
 
   // Check if all options are unique
   if (new Set(values).size !== options.length) {
-    throw new Error('Options must be unique');
+    throw new FieldMetadataException(
+      'Options must be unique',
+      FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
+    );
   }
 
   const validators = optionsValidatorsMap[type];
diff --git a/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.exception.ts b/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.exception.ts
new file mode 100644
index 000000000..2d489b132
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.exception.ts
@@ -0,0 +1,15 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class ObjectMetadataException extends CustomException {
+  code: ObjectMetadataExceptionCode;
+  constructor(message: string, code: ObjectMetadataExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum ObjectMetadataExceptionCode {
+  OBJECT_METADATA_NOT_FOUND = 'OBJECT_METADATA_NOT_FOUND',
+  INVALID_OBJECT_INPUT = 'INVALID_OBJECT_INPUT',
+  OBJECT_MUTATION_NOT_ALLOWED = 'OBJECT_MUTATION_NOT_ALLOWED',
+  OBJECT_ALREADY_EXISTS = 'OBJECT_ALREADY_EXISTS',
+}
diff --git a/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.resolver.ts b/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.resolver.ts
index ccb1b2a60..710e74d9d 100644
--- a/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.resolver.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.resolver.ts
@@ -12,6 +12,7 @@ import {
   UpdateOneObjectInput,
 } from 'src/engine/metadata-modules/object-metadata/dtos/update-object.input';
 import { BeforeUpdateOneObject } from 'src/engine/metadata-modules/object-metadata/hooks/before-update-one-object.hook';
+import { objectMetadataGraphqlApiExceptionHandler } from 'src/engine/metadata-modules/object-metadata/utils/object-metadata-graphql-api-exception-handler.util';
 
 @UseGuards(JwtAuthGuard)
 @Resolver(() => ObjectMetadataDTO)
@@ -26,7 +27,11 @@ export class ObjectMetadataResolver {
     @Args('input') input: DeleteOneObjectInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.objectMetadataService.deleteOneObject(input, workspaceId);
+    try {
+      return this.objectMetadataService.deleteOneObject(input, workspaceId);
+    } catch (error) {
+      objectMetadataGraphqlApiExceptionHandler(error);
+    }
   }
 
   @Mutation(() => ObjectMetadataDTO)
@@ -34,8 +39,12 @@ export class ObjectMetadataResolver {
     @Args('input') input: UpdateOneObjectInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    await this.beforeUpdateOneObject.run(input, workspaceId);
+    try {
+      await this.beforeUpdateOneObject.run(input, workspaceId);
 
-    return this.objectMetadataService.updateOneObject(input, workspaceId);
+      return this.objectMetadataService.updateOneObject(input, workspaceId);
+    } catch (error) {
+      objectMetadataGraphqlApiExceptionHandler(error);
+    }
   }
 }
diff --git a/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.service.ts b/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.service.ts
index 878a12192..c1e1d8111 100644
--- a/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.service.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.service.ts
@@ -1,9 +1,4 @@
-import {
-  BadRequestException,
-  ConflictException,
-  Injectable,
-  NotFoundException,
-} from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 
 import console from 'console';
@@ -56,6 +51,10 @@ import { mapUdtNameToFieldType } from 'src/engine/metadata-modules/remote-server
 import { WorkspaceCacheVersionService } from 'src/engine/metadata-modules/workspace-cache-version/workspace-cache-version.service';
 import { UpdateOneObjectInput } from 'src/engine/metadata-modules/object-metadata/dtos/update-object.input';
 import { RemoteTableRelationsService } from 'src/engine/metadata-modules/remote-server/remote-table/remote-table-relations/remote-table-relations.service';
+import {
+  ObjectMetadataException,
+  ObjectMetadataExceptionCode,
+} from 'src/engine/metadata-modules/object-metadata/object-metadata.exception';
 
 import { ObjectMetadataEntity } from './object-metadata.entity';
 
@@ -121,7 +120,10 @@ export class ObjectMetadataService extends TypeOrmQueryService<ObjectMetadataEnt
     });
 
     if (!objectMetadata) {
-      throw new NotFoundException('Object does not exist');
+      throw new ObjectMetadataException(
+        'Object does not exist',
+        ObjectMetadataExceptionCode.OBJECT_METADATA_NOT_FOUND,
+      );
     }
 
     // DELETE RELATIONS
@@ -159,8 +161,9 @@ export class ObjectMetadataService extends TypeOrmQueryService<ObjectMetadataEnt
       objectMetadataInput.nameSingular.toLowerCase() ===
       objectMetadataInput.namePlural.toLowerCase()
     ) {
-      throw new BadRequestException(
+      throw new ObjectMetadataException(
         'The singular and plural name cannot be the same for an object',
+        ObjectMetadataExceptionCode.INVALID_OBJECT_INPUT,
       );
     }
 
@@ -186,7 +189,10 @@ export class ObjectMetadataService extends TypeOrmQueryService<ObjectMetadataEnt
     });
 
     if (objectAlreadyExists) {
-      throw new ConflictException('Object already exists');
+      throw new ObjectMetadataException(
+        'Object already exists',
+        ObjectMetadataExceptionCode.OBJECT_ALREADY_EXISTS,
+      );
     }
 
     const isCustom = !objectMetadataInput.isRemote;
@@ -372,18 +378,25 @@ export class ObjectMetadataService extends TypeOrmQueryService<ObjectMetadataEnt
     workspaceId: string,
     options: FindOneOptions<ObjectMetadataEntity>,
   ): Promise<ObjectMetadataEntity> {
-    return this.objectMetadataRepository.findOneOrFail({
-      relations: [
-        'fields',
-        'fields.fromRelationMetadata',
-        'fields.toRelationMetadata',
-      ],
-      ...options,
-      where: {
-        ...options.where,
-        workspaceId,
-      },
-    });
+    try {
+      return this.objectMetadataRepository.findOneOrFail({
+        relations: [
+          'fields',
+          'fields.fromRelationMetadata',
+          'fields.toRelationMetadata',
+        ],
+        ...options,
+        where: {
+          ...options.where,
+          workspaceId,
+        },
+      });
+    } catch (error) {
+      throw new ObjectMetadataException(
+        'Object does not exist',
+        ObjectMetadataExceptionCode.OBJECT_METADATA_NOT_FOUND,
+      );
+    }
   }
 
   public async findManyWithinWorkspace(
diff --git a/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/assert-mutation-not-on-remote-object.util.ts b/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/assert-mutation-not-on-remote-object.util.ts
index 1bfcf6973..0db389d95 100644
--- a/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/assert-mutation-not-on-remote-object.util.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/assert-mutation-not-on-remote-object.util.ts
@@ -1,11 +1,17 @@
-import { BadRequestException } from '@nestjs/common';
-
 import { ObjectMetadataInterface } from 'src/engine/metadata-modules/field-metadata/interfaces/object-metadata.interface';
 
+import {
+  ObjectMetadataException,
+  ObjectMetadataExceptionCode,
+} from 'src/engine/metadata-modules/object-metadata/object-metadata.exception';
+
 export const assertMutationNotOnRemoteObject = (
   objectMetadataItem: ObjectMetadataInterface,
 ) => {
   if (objectMetadataItem.isRemote) {
-    throw new BadRequestException('Remote objects are read-only');
+    throw new ObjectMetadataException(
+      'Remote objects are read-only',
+      ObjectMetadataExceptionCode.OBJECT_MUTATION_NOT_ALLOWED,
+    );
   }
 };
diff --git a/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/object-metadata-graphql-api-exception-handler.util.ts b/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/object-metadata-graphql-api-exception-handler.util.ts
new file mode 100644
index 000000000..6961b65bf
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/object-metadata-graphql-api-exception-handler.util.ts
@@ -0,0 +1,30 @@
+import {
+  ObjectMetadataException,
+  ObjectMetadataExceptionCode,
+} from 'src/engine/metadata-modules/object-metadata/object-metadata.exception';
+import {
+  UserInputError,
+  ForbiddenError,
+  ConflictError,
+  InternalServerError,
+  NotFoundError,
+} from 'src/engine/utils/graphql-errors.util';
+
+export const objectMetadataGraphqlApiExceptionHandler = (error: Error) => {
+  if (error instanceof ObjectMetadataException) {
+    switch (error.code) {
+      case ObjectMetadataExceptionCode.OBJECT_METADATA_NOT_FOUND:
+        throw new NotFoundError(error.message);
+      case ObjectMetadataExceptionCode.INVALID_OBJECT_INPUT:
+        throw new UserInputError(error.message);
+      case ObjectMetadataExceptionCode.OBJECT_MUTATION_NOT_ALLOWED:
+        throw new ForbiddenError(error.message);
+      case ObjectMetadataExceptionCode.OBJECT_ALREADY_EXISTS:
+        throw new ConflictError(error.message);
+      default:
+        throw new InternalServerError(error.message);
+    }
+  }
+
+  throw error;
+};
diff --git a/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/validate-object-metadata-input.util.ts b/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/validate-object-metadata-input.util.ts
index 42d1c1b00..23087298b 100644
--- a/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/validate-object-metadata-input.util.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/validate-object-metadata-input.util.ts
@@ -1,9 +1,13 @@
-import { BadRequestException, ForbiddenException } from '@nestjs/common';
-
-import { InvalidStringException } from 'src/engine/metadata-modules/errors/InvalidStringException';
 import { CreateObjectInput } from 'src/engine/metadata-modules/object-metadata/dtos/create-object.input';
 import { UpdateObjectPayload } from 'src/engine/metadata-modules/object-metadata/dtos/update-object.input';
-import { validateMetadataName } from 'src/engine/metadata-modules/utils/validate-metadata-name.utils';
+import {
+  ObjectMetadataException,
+  ObjectMetadataExceptionCode,
+} from 'src/engine/metadata-modules/object-metadata/object-metadata.exception';
+import {
+  validateMetadataName,
+  InvalidStringException,
+} from 'src/engine/metadata-modules/utils/validate-metadata-name.utils';
 import { camelCase } from 'src/utils/camel-case';
 
 const coreObjectNames = [
@@ -55,7 +59,10 @@ export const validateObjectMetadataInputOrThrow = <
 const validateNameIsNotReservedKeywordOrThrow = (name?: string) => {
   if (name) {
     if (reservedKeywords.includes(name)) {
-      throw new ForbiddenException(`The name "${name}" is not available`);
+      throw new ObjectMetadataException(
+        `The name "${name}" is not available`,
+        ObjectMetadataExceptionCode.INVALID_OBJECT_INPUT,
+      );
     }
   }
 };
@@ -63,7 +70,10 @@ const validateNameIsNotReservedKeywordOrThrow = (name?: string) => {
 const validateNameCamelCasedOrThrow = (name?: string) => {
   if (name) {
     if (name !== camelCase(name)) {
-      throw new ForbiddenException(`Name should be in camelCase: ${name}`);
+      throw new ObjectMetadataException(
+        `Name should be in camelCase: ${name}`,
+        ObjectMetadataExceptionCode.INVALID_OBJECT_INPUT,
+      );
     }
   }
 };
@@ -75,8 +85,9 @@ const validateNameCharactersOrThrow = (name?: string) => {
     }
   } catch (error) {
     if (error instanceof InvalidStringException) {
-      throw new BadRequestException(
+      throw new ObjectMetadataException(
         `Characters used in name "${name}" are not supported`,
+        ObjectMetadataExceptionCode.INVALID_OBJECT_INPUT,
       );
     } else {
       throw error;
diff --git a/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.exception.ts b/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.exception.ts
new file mode 100644
index 000000000..4ce48e8b8
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.exception.ts
@@ -0,0 +1,15 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class RelationMetadataException extends CustomException {
+  code: RelationMetadataExceptionCode;
+  constructor(message: string, code: RelationMetadataExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum RelationMetadataExceptionCode {
+  RELATION_METADATA_NOT_FOUND = 'RELATION_METADATA_NOT_FOUND',
+  INVALID_RELATION_INPUT = 'INVALID_RELATION_INPUT',
+  RELATION_ALREADY_EXISTS = 'RELATION_ALREADY_EXISTS',
+  FOREIGN_KEY_NOT_FOUND = 'FOREIGN_KEY_NOT_FOUND',
+}
diff --git a/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.resolver.ts b/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.resolver.ts
index c7eb41498..9fcd2b80b 100644
--- a/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.resolver.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.resolver.ts
@@ -7,6 +7,7 @@ import { RelationMetadataService } from 'src/engine/metadata-modules/relation-me
 import { Workspace } from 'src/engine/core-modules/workspace/workspace.entity';
 import { RelationMetadataDTO } from 'src/engine/metadata-modules/relation-metadata/dtos/relation-metadata.dto';
 import { DeleteOneRelationInput } from 'src/engine/metadata-modules/relation-metadata/dtos/delete-relation.input';
+import { relationMetadataGraphqlApiExceptionHandler } from 'src/engine/metadata-modules/relation-metadata/utils/relation-metadata-graphql-api-exception-handler.util';
 
 @UseGuards(JwtAuthGuard)
 @Resolver()
@@ -20,9 +21,13 @@ export class RelationMetadataResolver {
     @Args('input') input: DeleteOneRelationInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.relationMetadataService.deleteOneRelation(
-      input.id,
-      workspaceId,
-    );
+    try {
+      return this.relationMetadataService.deleteOneRelation(
+        input.id,
+        workspaceId,
+      );
+    } catch (error) {
+      relationMetadataGraphqlApiExceptionHandler(error);
+    }
   }
 }
diff --git a/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.service.ts b/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.service.ts
index 8915b60ab..8ba348dcd 100644
--- a/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.service.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/relation-metadata/relation-metadata.service.ts
@@ -1,9 +1,4 @@
-import {
-  BadRequestException,
-  ConflictException,
-  Injectable,
-  NotFoundException,
-} from '@nestjs/common';
+import { Injectable, NotFoundException } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 
 import { TypeOrmQueryService } from '@ptc-org/nestjs-query-typeorm';
@@ -28,9 +23,15 @@ import {
 import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
 import { computeObjectTargetTable } from 'src/engine/utils/compute-object-target-table.util';
 import { generateMigrationName } from 'src/engine/metadata-modules/workspace-migration/utils/generate-migration-name.util';
-import { InvalidStringException } from 'src/engine/metadata-modules/errors/InvalidStringException';
-import { validateMetadataName } from 'src/engine/metadata-modules/utils/validate-metadata-name.utils';
+import {
+  validateMetadataName,
+  InvalidStringException,
+} from 'src/engine/metadata-modules/utils/validate-metadata-name.utils';
 import { WorkspaceCacheVersionService } from 'src/engine/metadata-modules/workspace-cache-version/workspace-cache-version.service';
+import {
+  RelationMetadataException,
+  RelationMetadataExceptionCode,
+} from 'src/engine/metadata-modules/relation-metadata/relation-metadata.exception';
 
 import {
   RelationMetadataEntity,
@@ -66,8 +67,9 @@ export class RelationMetadataService extends TypeOrmQueryService<RelationMetadat
       validateMetadataName(relationMetadataInput.toName);
     } catch (error) {
       if (error instanceof InvalidStringException) {
-        throw new BadRequestException(
+        throw new RelationMetadataException(
           `Characters used in name "${relationMetadataInput.fromName}" or "${relationMetadataInput.toName}" are not supported`,
+          RelationMetadataExceptionCode.INVALID_RELATION_INPUT,
         );
       } else {
         throw error;
@@ -132,8 +134,9 @@ export class RelationMetadataService extends TypeOrmQueryService<RelationMetadat
     if (
       relationMetadataInput.relationType === RelationMetadataType.MANY_TO_MANY
     ) {
-      throw new BadRequestException(
+      throw new RelationMetadataException(
         'Many to many relations are not supported yet',
+        RelationMetadataExceptionCode.INVALID_RELATION_INPUT,
       );
     }
 
@@ -142,8 +145,9 @@ export class RelationMetadataService extends TypeOrmQueryService<RelationMetadat
         undefined ||
       objectMetadataMap[relationMetadataInput.toObjectMetadataId] === undefined
     ) {
-      throw new NotFoundException(
+      throw new RelationMetadataException(
         'Can\t find an existing object matching with fromObjectMetadataId or toObjectMetadataId',
+        RelationMetadataExceptionCode.RELATION_METADATA_NOT_FOUND,
       );
     }
 
@@ -177,12 +181,13 @@ export class RelationMetadataService extends TypeOrmQueryService<RelationMetadat
       );
 
     if (fieldAlreadyExists) {
-      throw new ConflictException(
+      throw new RelationMetadataException(
         `Field on ${
           objectMetadataMap[
             relationMetadataInput[`${relationDirection}ObjectMetadataId`]
           ].nameSingular
         } already exists`,
+        RelationMetadataExceptionCode.RELATION_ALREADY_EXISTS,
       );
     }
   }
@@ -335,7 +340,10 @@ export class RelationMetadataService extends TypeOrmQueryService<RelationMetadat
     });
 
     if (!relationMetadata) {
-      throw new NotFoundException('Relation does not exist');
+      throw new RelationMetadataException(
+        'Relation does not exist',
+        RelationMetadataExceptionCode.RELATION_METADATA_NOT_FOUND,
+      );
     }
 
     const foreignKeyFieldMetadataName = `${camelCase(
@@ -351,8 +359,9 @@ export class RelationMetadataService extends TypeOrmQueryService<RelationMetadat
     });
 
     if (!foreignKeyFieldMetadata) {
-      throw new NotFoundException(
+      throw new RelationMetadataException(
         `Foreign key fieldMetadata not found (${foreignKeyFieldMetadataName}) for relation ${relationMetadata.id}`,
+        RelationMetadataExceptionCode.FOREIGN_KEY_NOT_FOUND,
       );
     }
 
@@ -420,6 +429,7 @@ export class RelationMetadataService extends TypeOrmQueryService<RelationMetadat
 
       return (
         foundRelationMetadataItem ??
+        // TODO: return a relation metadata not found exception
         new NotFoundException(
           `RelationMetadata with fieldMetadataId ${fieldMetadataId} not found`,
         )
diff --git a/packages/twenty-server/src/engine/metadata-modules/relation-metadata/utils/relation-metadata-graphql-api-exception-handler.util.ts b/packages/twenty-server/src/engine/metadata-modules/relation-metadata/utils/relation-metadata-graphql-api-exception-handler.util.ts
new file mode 100644
index 000000000..89a66cfb8
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/relation-metadata/utils/relation-metadata-graphql-api-exception-handler.util.ts
@@ -0,0 +1,28 @@
+import {
+  RelationMetadataException,
+  RelationMetadataExceptionCode,
+} from 'src/engine/metadata-modules/relation-metadata/relation-metadata.exception';
+import {
+  UserInputError,
+  ConflictError,
+  InternalServerError,
+  NotFoundError,
+} from 'src/engine/utils/graphql-errors.util';
+
+export const relationMetadataGraphqlApiExceptionHandler = (error: Error) => {
+  if (error instanceof RelationMetadataException) {
+    switch (error.code) {
+      case RelationMetadataExceptionCode.RELATION_METADATA_NOT_FOUND:
+        throw new NotFoundError(error.message);
+      case RelationMetadataExceptionCode.INVALID_RELATION_INPUT:
+        throw new UserInputError(error.message);
+      case RelationMetadataExceptionCode.RELATION_ALREADY_EXISTS:
+        throw new ConflictError(error.message);
+      case RelationMetadataExceptionCode.FOREIGN_KEY_NOT_FOUND:
+      default:
+        throw new InternalServerError(error.message);
+    }
+  }
+
+  throw error;
+};
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.exception.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.exception.ts
new file mode 100644
index 000000000..6aa035234
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.exception.ts
@@ -0,0 +1,16 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class RemoteServerException extends CustomException {
+  code: RemoteServerExceptionCode;
+  constructor(message: string, code: RemoteServerExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum RemoteServerExceptionCode {
+  REMOTE_SERVER_NOT_FOUND = 'REMOTE_SERVER_NOT_FOUND',
+  REMOTE_SERVER_ALREADY_EXISTS = 'REMOTE_SERVER_ALREADY_EXISTS',
+  REMOTE_SERVER_MUTATION_NOT_ALLOWED = 'REMOTE_SERVER_MUTATION_NOT_ALLOWED',
+  REMOTE_SERVER_CONNECTION_ERROR = 'REMOTE_SERVER_CONNECTION_ERROR',
+  INVALID_REMOTE_SERVER_INPUT = 'INVALID_REMOTE_SERVER_INPUT',
+}
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.resolver.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.resolver.ts
index 04d44a190..e5f72621a 100644
--- a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.resolver.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.resolver.ts
@@ -11,6 +11,7 @@ import { RemoteServerDTO } from 'src/engine/metadata-modules/remote-server/dtos/
 import { UpdateRemoteServerInput } from 'src/engine/metadata-modules/remote-server/dtos/update-remote-server.input';
 import { RemoteServerType } from 'src/engine/metadata-modules/remote-server/remote-server.entity';
 import { RemoteServerService } from 'src/engine/metadata-modules/remote-server/remote-server.service';
+import { remoteServerGraphqlApiExceptionHandler } from 'src/engine/metadata-modules/remote-server/utils/remote-server-graphql-api-exception-handler.util';
 
 @UseGuards(JwtAuthGuard)
 @Resolver()
@@ -24,7 +25,11 @@ export class RemoteServerResolver {
     @Args('input') input: CreateRemoteServerInput<RemoteServerType>,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.remoteServerService.createOneRemoteServer(input, workspaceId);
+    try {
+      return this.remoteServerService.createOneRemoteServer(input, workspaceId);
+    } catch (error) {
+      remoteServerGraphqlApiExceptionHandler(error);
+    }
   }
 
   @Mutation(() => RemoteServerDTO)
@@ -32,7 +37,11 @@ export class RemoteServerResolver {
     @Args('input') input: UpdateRemoteServerInput<RemoteServerType>,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.remoteServerService.updateOneRemoteServer(input, workspaceId);
+    try {
+      return this.remoteServerService.updateOneRemoteServer(input, workspaceId);
+    } catch (error) {
+      remoteServerGraphqlApiExceptionHandler(error);
+    }
   }
 
   @Mutation(() => RemoteServerDTO)
@@ -40,7 +49,11 @@ export class RemoteServerResolver {
     @Args('input') { id }: RemoteServerIdInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.remoteServerService.deleteOneRemoteServer(id, workspaceId);
+    try {
+      return this.remoteServerService.deleteOneRemoteServer(id, workspaceId);
+    } catch (error) {
+      remoteServerGraphqlApiExceptionHandler(error);
+    }
   }
 
   @Query(() => RemoteServerDTO)
@@ -48,7 +61,14 @@ export class RemoteServerResolver {
     @Args('input') { id }: RemoteServerIdInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.remoteServerService.findOneByIdWithinWorkspace(id, workspaceId);
+    try {
+      return this.remoteServerService.findOneByIdWithinWorkspace(
+        id,
+        workspaceId,
+      );
+    } catch (error) {
+      remoteServerGraphqlApiExceptionHandler(error);
+    }
   }
 
   @Query(() => [RemoteServerDTO])
@@ -57,9 +77,13 @@ export class RemoteServerResolver {
     { foreignDataWrapperType }: RemoteServerTypeInput<RemoteServerType>,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.remoteServerService.findManyByTypeWithinWorkspace(
-      foreignDataWrapperType,
-      workspaceId,
-    );
+    try {
+      return this.remoteServerService.findManyByTypeWithinWorkspace(
+        foreignDataWrapperType,
+        workspaceId,
+      );
+    } catch (error) {
+      remoteServerGraphqlApiExceptionHandler(error);
+    }
   }
 }
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.service.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.service.ts
index b7ad3a2e7..d1c241827 100644
--- a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.service.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.service.ts
@@ -1,8 +1,4 @@
-import {
-  ForbiddenException,
-  Injectable,
-  NotFoundException,
-} from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
 import { InjectDataSource, InjectRepository } from '@nestjs/typeorm';
 
 import isEmpty from 'lodash.isempty';
@@ -27,6 +23,10 @@ import { WorkspaceDataSourceService } from 'src/engine/workspace-datasource/work
 import { buildUpdateRemoteServerRawQuery } from 'src/engine/metadata-modules/remote-server/utils/build-update-remote-server-raw-query.utils';
 import { validateRemoteServerType } from 'src/engine/metadata-modules/remote-server/utils/validate-remote-server-type.util';
 import { FeatureFlagEntity } from 'src/engine/core-modules/feature-flag/feature-flag.entity';
+import {
+  RemoteServerException,
+  RemoteServerExceptionCode,
+} from 'src/engine/metadata-modules/remote-server/remote-server.exception';
 
 @Injectable()
 export class RemoteServerService<T extends RemoteServerType> {
@@ -122,7 +122,10 @@ export class RemoteServerService<T extends RemoteServerType> {
     );
 
     if (!remoteServer) {
-      throw new NotFoundException('Remote server does not exist');
+      throw new RemoteServerException(
+        'Remote server does not exist',
+        RemoteServerExceptionCode.REMOTE_SERVER_NOT_FOUND,
+      );
     }
 
     const currentRemoteTablesForServer =
@@ -132,8 +135,9 @@ export class RemoteServerService<T extends RemoteServerType> {
       });
 
     if (currentRemoteTablesForServer.length > 0) {
-      throw new ForbiddenException(
+      throw new RemoteServerException(
         'Cannot update remote server with synchronized tables',
+        RemoteServerExceptionCode.REMOTE_SERVER_MUTATION_NOT_ALLOWED,
       );
     }
 
@@ -207,7 +211,10 @@ export class RemoteServerService<T extends RemoteServerType> {
     });
 
     if (!remoteServer) {
-      throw new NotFoundException('Remote server does not exist');
+      throw new RemoteServerException(
+        'Remote server does not exist',
+        RemoteServerExceptionCode.REMOTE_SERVER_NOT_FOUND,
+      );
     }
 
     await this.remoteTableService.unsyncAll(workspaceId, remoteServer);
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/distant-table/distant-table.exception.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/distant-table/distant-table.exception.ts
new file mode 100644
index 000000000..609da7a6f
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/distant-table/distant-table.exception.ts
@@ -0,0 +1,13 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class DistantTableException extends CustomException {
+  code: DistantTableExceptionCode;
+  constructor(message: string, code: DistantTableExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum DistantTableExceptionCode {
+  INTERNAL_SERVER_ERROR = 'INTERNAL_SERVER_ERROR',
+  TIMEOUT_ERROR = 'TIMEOUT_ERROR',
+}
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/distant-table/distant-table.service.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/distant-table/distant-table.service.ts
index d0e5fdade..337ab25be 100644
--- a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/distant-table/distant-table.service.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/distant-table/distant-table.service.ts
@@ -1,8 +1,4 @@
-import {
-  BadRequestException,
-  Injectable,
-  RequestTimeoutException,
-} from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 
 import { EntityManager, Repository } from 'typeorm';
@@ -17,6 +13,10 @@ import { DistantTables } from 'src/engine/metadata-modules/remote-server/remote-
 import { STRIPE_DISTANT_TABLES } from 'src/engine/metadata-modules/remote-server/remote-table/distant-table/utils/stripe-distant-tables.util';
 import { PostgresTableSchemaColumn } from 'src/engine/metadata-modules/remote-server/types/postgres-table-schema-column';
 import { isQueryTimeoutError } from 'src/engine/utils/query-timeout.util';
+import {
+  DistantTableException,
+  DistantTableExceptionCode,
+} from 'src/engine/metadata-modules/remote-server/remote-table/distant-table/distant-table.exception';
 
 @Injectable()
 export class DistantTableService {
@@ -64,7 +64,10 @@ export class DistantTableService {
     tableName?: string,
   ): Promise<DistantTables> {
     if (!remoteServer.schema) {
-      throw new BadRequestException('Remote server schema is not defined');
+      throw new DistantTableException(
+        'Remote server schema is not defined',
+        DistantTableExceptionCode.INTERNAL_SERVER_ERROR,
+      );
     }
 
     const tmpSchemaId = v4();
@@ -116,8 +119,9 @@ export class DistantTableService {
       return distantTables;
     } catch (error) {
       if (isQueryTimeoutError(error)) {
-        throw new RequestTimeoutException(
+        throw new DistantTableException(
           `Could not find distant tables: ${error.message}`,
+          DistantTableExceptionCode.TIMEOUT_ERROR,
         );
       }
 
@@ -132,8 +136,9 @@ export class DistantTableService {
       case RemoteServerType.STRIPE_FDW:
         return STRIPE_DISTANT_TABLES;
       default:
-        throw new BadRequestException(
+        throw new DistantTableException(
           `Type ${remoteServer.foreignDataWrapperType} does not have a static schema.`,
+          DistantTableExceptionCode.INTERNAL_SERVER_ERROR,
         );
     }
   }
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/foreign-table/foreign-table.exception.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/foreign-table/foreign-table.exception.ts
new file mode 100644
index 000000000..3f3305823
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/foreign-table/foreign-table.exception.ts
@@ -0,0 +1,13 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class ForeignTableException extends CustomException {
+  code: ForeignTableExceptionCode;
+  constructor(message: string, code: ForeignTableExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum ForeignTableExceptionCode {
+  FOREIGN_TABLE_MUTATION_NOT_ALLOWED = 'FOREIGN_TABLE_MUTATION_NOT_ALLOWED',
+  INVALID_FOREIGN_TABLE_INPUT = 'INVALID_FOREIGN_TABLE_INPUT',
+}
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/foreign-table/foreign-table.service.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/foreign-table/foreign-table.service.ts
index c5951b69b..4f1f2d1cd 100644
--- a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/foreign-table/foreign-table.service.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/foreign-table/foreign-table.service.ts
@@ -1,10 +1,14 @@
-import { BadRequestException, Injectable } from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
 
 import {
   RemoteServerEntity,
   RemoteServerType,
 } from 'src/engine/metadata-modules/remote-server/remote-server.entity';
 import { RemoteTableStatus } from 'src/engine/metadata-modules/remote-server/remote-table/dtos/remote-table.dto';
+import {
+  ForeignTableException,
+  ForeignTableExceptionCode,
+} from 'src/engine/metadata-modules/remote-server/remote-table/foreign-table/foreign-table.exception';
 import { getForeignTableColumnName } from 'src/engine/metadata-modules/remote-server/remote-table/foreign-table/utils/get-foreign-table-column-name.util';
 import { PostgresTableSchemaColumn } from 'src/engine/metadata-modules/remote-server/types/postgres-table-schema-column';
 import { WorkspaceCacheVersionService } from 'src/engine/metadata-modules/workspace-cache-version/workspace-cache-version.service';
@@ -90,8 +94,9 @@ export class ForeignTableService {
     } catch (exception) {
       this.workspaceMigrationService.deleteById(workspaceMigration.id);
 
-      throw new BadRequestException(
+      throw new ForeignTableException(
         'Could not create foreign table. The table may already exists or a column type may not be supported.',
+        ForeignTableExceptionCode.INVALID_FOREIGN_TABLE_INPUT,
       );
     }
   }
@@ -130,7 +135,10 @@ export class ForeignTableService {
     } catch (exception) {
       this.workspaceMigrationService.deleteById(workspaceMigration.id);
 
-      throw new BadRequestException('Could not alter foreign table.');
+      throw new ForeignTableException(
+        'Could not alter foreign table.',
+        ForeignTableExceptionCode.FOREIGN_TABLE_MUTATION_NOT_ALLOWED,
+      );
     }
   }
 
@@ -167,7 +175,10 @@ export class ForeignTableService {
       case RemoteServerType.STRIPE_FDW:
         return { object: distantTableName };
       default:
-        throw new BadRequestException('Foreign data wrapper not supported');
+        throw new ForeignTableException(
+          'Foreign data wrapper not supported',
+          ForeignTableExceptionCode.INVALID_FOREIGN_TABLE_INPUT,
+        );
     }
   }
 }
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.exception.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.exception.ts
new file mode 100644
index 000000000..32e99227c
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.exception.ts
@@ -0,0 +1,17 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class RemoteTableException extends CustomException {
+  code: RemoteTableExceptionCode;
+  constructor(message: string, code: RemoteTableExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum RemoteTableExceptionCode {
+  REMOTE_TABLE_NOT_FOUND = 'REMOTE_TABLE_NOT_FOUND',
+  INVALID_REMOTE_TABLE_INPUT = 'INVALID_REMOTE_TABLE_INPUT',
+  REMOTE_TABLE_ALREADY_EXISTS = 'REMOTE_TABLE_ALREADY_EXISTS',
+  NO_FOREIGN_TABLES_FOUND = 'NO_FOREIGN_TABLES_FOUND',
+  NO_OBJECT_METADATA_FOUND = 'NO_OBJECT_METADATA_FOUND',
+  NO_FIELD_METADATA_FOUND = 'NO_FIELD_METADATA_FOUND',
+}
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.resolver.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.resolver.ts
index 37abfc748..745df5eab 100644
--- a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.resolver.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.resolver.ts
@@ -8,6 +8,7 @@ import { FindManyRemoteTablesInput } from 'src/engine/metadata-modules/remote-se
 import { RemoteTableInput } from 'src/engine/metadata-modules/remote-server/remote-table/dtos/remote-table-input';
 import { RemoteTableDTO } from 'src/engine/metadata-modules/remote-server/remote-table/dtos/remote-table.dto';
 import { RemoteTableService } from 'src/engine/metadata-modules/remote-server/remote-table/remote-table.service';
+import { remoteTableGraphqlApiExceptionHandler } from 'src/engine/metadata-modules/remote-server/remote-table/utils/remote-table-graphql-api-exception-handler.util';
 
 @UseGuards(JwtAuthGuard)
 @Resolver()
@@ -19,11 +20,15 @@ export class RemoteTableResolver {
     @Args('input') input: FindManyRemoteTablesInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.remoteTableService.findDistantTablesWithStatus(
-      input.id,
-      workspaceId,
-      input.shouldFetchPendingSchemaUpdates,
-    );
+    try {
+      return this.remoteTableService.findDistantTablesWithStatus(
+        input.id,
+        workspaceId,
+        input.shouldFetchPendingSchemaUpdates,
+      );
+    } catch (error) {
+      remoteTableGraphqlApiExceptionHandler(error);
+    }
   }
 
   @Mutation(() => RemoteTableDTO)
@@ -31,7 +36,11 @@ export class RemoteTableResolver {
     @Args('input') input: RemoteTableInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.remoteTableService.syncRemoteTable(input, workspaceId);
+    try {
+      return this.remoteTableService.syncRemoteTable(input, workspaceId);
+    } catch (error) {
+      remoteTableGraphqlApiExceptionHandler(error);
+    }
   }
 
   @Mutation(() => RemoteTableDTO)
@@ -39,7 +48,11 @@ export class RemoteTableResolver {
     @Args('input') input: RemoteTableInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.remoteTableService.unsyncRemoteTable(input, workspaceId);
+    try {
+      return this.remoteTableService.unsyncRemoteTable(input, workspaceId);
+    } catch (error) {
+      remoteTableGraphqlApiExceptionHandler(error);
+    }
   }
 
   @Mutation(() => RemoteTableDTO)
@@ -47,9 +60,13 @@ export class RemoteTableResolver {
     @Args('input') input: RemoteTableInput,
     @AuthWorkspace() { id: workspaceId }: Workspace,
   ) {
-    return this.remoteTableService.syncRemoteTableSchemaChanges(
-      input,
-      workspaceId,
-    );
+    try {
+      return this.remoteTableService.syncRemoteTableSchemaChanges(
+        input,
+        workspaceId,
+      );
+    } catch (error) {
+      remoteTableGraphqlApiExceptionHandler(error);
+    }
   }
 }
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.service.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.service.ts
index 732108af8..9102839ed 100644
--- a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.service.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/remote-table.service.ts
@@ -1,4 +1,4 @@
-import { BadRequestException, Logger, NotFoundException } from '@nestjs/common';
+import { Logger } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 
 import { Repository } from 'typeorm';
@@ -40,6 +40,10 @@ import {
 } from 'src/engine/metadata-modules/workspace-migration/workspace-migration.entity';
 import { CreateFieldInput } from 'src/engine/metadata-modules/field-metadata/dtos/create-field.input';
 import { FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+import {
+  RemoteTableException,
+  RemoteTableExceptionCode,
+} from 'src/engine/metadata-modules/remote-server/remote-table/remote-table.exception';
 
 export class RemoteTableService {
   private readonly logger = new Logger(RemoteTableService.name);
@@ -74,7 +78,10 @@ export class RemoteTableService {
     });
 
     if (!remoteServer) {
-      throw new NotFoundException('Remote server does not exist');
+      throw new RemoteTableException(
+        'Remote server does not exist',
+        RemoteTableExceptionCode.INVALID_REMOTE_TABLE_INPUT,
+      );
     }
 
     const currentRemoteTables = await this.findRemoteTablesByServerId({
@@ -148,7 +155,10 @@ export class RemoteTableService {
     });
 
     if (!remoteServer) {
-      throw new NotFoundException('Remote server does not exist');
+      throw new RemoteTableException(
+        'Remote server does not exist',
+        RemoteTableExceptionCode.INVALID_REMOTE_TABLE_INPUT,
+      );
     }
 
     const currentRemoteTableWithSameDistantName =
@@ -161,7 +171,10 @@ export class RemoteTableService {
       });
 
     if (currentRemoteTableWithSameDistantName) {
-      throw new BadRequestException('Remote table already exists');
+      throw new RemoteTableException(
+        'Remote server does not exist',
+        RemoteTableExceptionCode.REMOTE_TABLE_ALREADY_EXISTS,
+      );
     }
 
     const dataSourceMetatada =
@@ -200,7 +213,10 @@ export class RemoteTableService {
       );
 
     if (!distantTableColumns) {
-      throw new BadRequestException('Table not found');
+      throw new RemoteTableException(
+        'Remote server does not exist',
+        RemoteTableExceptionCode.REMOTE_TABLE_NOT_FOUND,
+      );
     }
 
     // We only support remote tables with an id column for now.
@@ -209,7 +225,10 @@ export class RemoteTableService {
     );
 
     if (!distantTableIdColumn) {
-      throw new BadRequestException('Remote table must have an id column');
+      throw new RemoteTableException(
+        'Remote server does not exist',
+        RemoteTableExceptionCode.INVALID_REMOTE_TABLE_INPUT,
+      );
     }
 
     await this.foreignTableService.createForeignTable(
@@ -250,7 +269,10 @@ export class RemoteTableService {
     });
 
     if (!remoteServer) {
-      throw new NotFoundException('Remote server does not exist');
+      throw new RemoteTableException(
+        'Remote server does not exist',
+        RemoteTableExceptionCode.INVALID_REMOTE_TABLE_INPUT,
+      );
     }
 
     const remoteTable = await this.remoteTableRepository.findOne({
@@ -262,7 +284,10 @@ export class RemoteTableService {
     });
 
     if (!remoteTable) {
-      throw new NotFoundException('Remote table does not exist');
+      throw new RemoteTableException(
+        'Remote table does not exist',
+        RemoteTableExceptionCode.REMOTE_TABLE_NOT_FOUND,
+      );
     }
 
     await this.unsyncOne(workspaceId, remoteTable, remoteServer);
@@ -302,7 +327,10 @@ export class RemoteTableService {
     });
 
     if (!remoteServer) {
-      throw new NotFoundException('Remote server does not exist');
+      throw new RemoteTableException(
+        'Remote server does not exist',
+        RemoteTableExceptionCode.INVALID_REMOTE_TABLE_INPUT,
+      );
     }
 
     const remoteTable = await this.remoteTableRepository.findOne({
@@ -314,7 +342,10 @@ export class RemoteTableService {
     });
 
     if (!remoteTable) {
-      throw new NotFoundException('Remote table does not exist');
+      throw new RemoteTableException(
+        'Remote table does not exist',
+        RemoteTableExceptionCode.REMOTE_TABLE_NOT_FOUND,
+      );
     }
 
     const distantTableColumns =
@@ -379,7 +410,10 @@ export class RemoteTableService {
       );
 
     if (!currentForeignTableNames.includes(remoteTable.localTableName)) {
-      throw new NotFoundException('Foreign table does not exist');
+      throw new RemoteTableException(
+        'Foreign table does not exist',
+        RemoteTableExceptionCode.NO_FOREIGN_TABLES_FOUND,
+      );
     }
 
     const objectMetadata =
@@ -507,8 +541,9 @@ export class RemoteTableService {
       });
 
     if (!objectMetadata) {
-      throw new NotFoundException(
+      throw new RemoteTableException(
         `Cannot find associated object for table ${foreignTableName}`,
+        RemoteTableExceptionCode.NO_OBJECT_METADATA_FOUND,
       );
     }
     for (const columnUpdate of columnsUpdates) {
@@ -547,8 +582,9 @@ export class RemoteTableService {
         });
 
       if (!fieldMetadataToDelete) {
-        throw new NotFoundException(
+        throw new RemoteTableException(
           `Cannot find associated field metadata for column ${columnName}`,
+          RemoteTableExceptionCode.NO_FIELD_METADATA_FOUND,
         );
       }
 
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/utils/get-remote-table-local-name.util.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/utils/get-remote-table-local-name.util.ts
index 92008e169..1df79156f 100644
--- a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/utils/get-remote-table-local-name.util.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/utils/get-remote-table-local-name.util.ts
@@ -1,9 +1,11 @@
-import { BadRequestException } from '@nestjs/common/exceptions';
-
 import { singular } from 'pluralize';
 import { DataSource } from 'typeorm';
 
 import { camelCase } from 'src/utils/camel-case';
+import {
+  RemoteTableException,
+  RemoteTableExceptionCode,
+} from 'src/engine/metadata-modules/remote-server/remote-table/remote-table.exception';
 
 const MAX_SUFFIX = 10;
 
@@ -55,5 +57,8 @@ export const getRemoteTableLocalName = async (
     }
   }
 
-  throw new BadRequestException('Table name is already taken.');
+  throw new RemoteTableException(
+    'Table name is already taken',
+    RemoteTableExceptionCode.INVALID_REMOTE_TABLE_INPUT,
+  );
 };
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/utils/remote-table-graphql-api-exception-handler.util.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/utils/remote-table-graphql-api-exception-handler.util.ts
new file mode 100644
index 000000000..b7d65a9c1
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/remote-table/utils/remote-table-graphql-api-exception-handler.util.ts
@@ -0,0 +1,30 @@
+import {
+  RemoteTableException,
+  RemoteTableExceptionCode,
+} from 'src/engine/metadata-modules/remote-server/remote-table/remote-table.exception';
+import {
+  UserInputError,
+  ConflictError,
+  InternalServerError,
+  NotFoundError,
+} from 'src/engine/utils/graphql-errors.util';
+
+export const remoteTableGraphqlApiExceptionHandler = (error: Error) => {
+  if (error instanceof RemoteTableException) {
+    switch (error.code) {
+      case RemoteTableExceptionCode.REMOTE_TABLE_NOT_FOUND:
+      case RemoteTableExceptionCode.NO_OBJECT_METADATA_FOUND:
+      case RemoteTableExceptionCode.NO_FOREIGN_TABLES_FOUND:
+      case RemoteTableExceptionCode.NO_FIELD_METADATA_FOUND:
+        throw new NotFoundError(error.message);
+      case RemoteTableExceptionCode.INVALID_REMOTE_TABLE_INPUT:
+        throw new UserInputError(error.message);
+      case RemoteTableExceptionCode.REMOTE_TABLE_ALREADY_EXISTS:
+        throw new ConflictError(error.message);
+      default:
+        throw new InternalServerError(error.message);
+    }
+  }
+
+  throw error;
+};
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/build-update-remote-server-raw-query.utils.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/build-update-remote-server-raw-query.utils.ts
index fff4778db..3e23e9b55 100644
--- a/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/build-update-remote-server-raw-query.utils.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/build-update-remote-server-raw-query.utils.ts
@@ -1,10 +1,12 @@
-import { BadRequestException } from '@nestjs/common';
-
 import {
   ForeignDataWrapperOptions,
   RemoteServerEntity,
   RemoteServerType,
 } from 'src/engine/metadata-modules/remote-server/remote-server.entity';
+import {
+  RemoteServerException,
+  RemoteServerExceptionCode,
+} from 'src/engine/metadata-modules/remote-server/remote-server.exception';
 import { UserMappingOptions } from 'src/engine/metadata-modules/remote-server/types/user-mapping-options';
 
 export type DeepPartial<T> = {
@@ -49,7 +51,10 @@ export const buildUpdateRemoteServerRawQuery = (
   }
 
   if (options.length < 1) {
-    throw new BadRequestException('No fields to update');
+    throw new RemoteServerException(
+      'No fields to update',
+      RemoteServerExceptionCode.INVALID_REMOTE_SERVER_INPUT,
+    );
   }
 
   const rawQuery = `UPDATE metadata."remoteServer" SET ${options.join(
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/remote-server-graphql-api-exception-handler.util.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/remote-server-graphql-api-exception-handler.util.ts
new file mode 100644
index 000000000..394eb7330
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/remote-server-graphql-api-exception-handler.util.ts
@@ -0,0 +1,30 @@
+import {
+  RemoteServerException,
+  RemoteServerExceptionCode,
+} from 'src/engine/metadata-modules/remote-server/remote-server.exception';
+import {
+  UserInputError,
+  ForbiddenError,
+  ConflictError,
+  InternalServerError,
+  NotFoundError,
+} from 'src/engine/utils/graphql-errors.util';
+
+export const remoteServerGraphqlApiExceptionHandler = (error: any) => {
+  if (error instanceof RemoteServerException) {
+    switch (error.code) {
+      case RemoteServerExceptionCode.REMOTE_SERVER_NOT_FOUND:
+        throw new NotFoundError(error.message);
+      case RemoteServerExceptionCode.INVALID_REMOTE_SERVER_INPUT:
+        throw new UserInputError(error.message);
+      case RemoteServerExceptionCode.REMOTE_SERVER_MUTATION_NOT_ALLOWED:
+        throw new ForbiddenError(error.message);
+      case RemoteServerExceptionCode.REMOTE_SERVER_ALREADY_EXISTS:
+        throw new ConflictError(error.message);
+      default:
+        throw new InternalServerError(error.message);
+    }
+  }
+
+  throw error;
+};
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/validate-remote-server-input.utils.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/validate-remote-server-input.utils.ts
index 99de7fa95..38cfecdcf 100644
--- a/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/validate-remote-server-input.utils.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/validate-remote-server-input.utils.ts
@@ -1,7 +1,10 @@
-import { BadRequestException } from '@nestjs/common';
-
 import { isDefined } from 'class-validator';
 
+import {
+  RemoteServerException,
+  RemoteServerExceptionCode,
+} from 'src/engine/metadata-modules/remote-server/remote-server.exception';
+
 const INPUT_REGEX = /^([A-Za-z0-9\-_.@]+)$/;
 
 export const validateObjectAgainstInjections = (input: object) => {
@@ -21,6 +24,9 @@ export const validateObjectAgainstInjections = (input: object) => {
 
 export const validateStringAgainstInjections = (input: string) => {
   if (!INPUT_REGEX.test(input)) {
-    throw new BadRequestException('Invalid remote server input');
+    throw new RemoteServerException(
+      'Invalid remote server input',
+      RemoteServerExceptionCode.INVALID_REMOTE_SERVER_INPUT,
+    );
   }
 };
diff --git a/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/validate-remote-server-type.util.ts b/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/validate-remote-server-type.util.ts
index 7a158e6a7..333353970 100644
--- a/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/validate-remote-server-type.util.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/remote-server/utils/validate-remote-server-type.util.ts
@@ -1,5 +1,3 @@
-import { BadRequestException } from '@nestjs/common';
-
 import { Repository } from 'typeorm';
 
 import {
@@ -7,6 +5,10 @@ import {
   FeatureFlagKeys,
 } from 'src/engine/core-modules/feature-flag/feature-flag.entity';
 import { RemoteServerType } from 'src/engine/metadata-modules/remote-server/remote-server.entity';
+import {
+  RemoteServerException,
+  RemoteServerExceptionCode,
+} from 'src/engine/metadata-modules/remote-server/remote-server.exception';
 
 export const validateRemoteServerType = async (
   remoteServerType: RemoteServerType,
@@ -24,7 +26,10 @@ export const validateRemoteServerType = async (
   const featureFlagEnabled = featureFlag && featureFlag.value;
 
   if (!featureFlagEnabled) {
-    throw new BadRequestException(`Type ${remoteServerType} is not supported.`);
+    throw new RemoteServerException(
+      `Type ${remoteServerType} is not supported.`,
+      RemoteServerExceptionCode.INVALID_REMOTE_SERVER_INPUT,
+    );
   }
 };
 
@@ -35,8 +40,9 @@ const getFeatureFlagKey = (remoteServerType: RemoteServerType) => {
     case RemoteServerType.STRIPE_FDW:
       return FeatureFlagKeys.IsStripeIntegrationEnabled;
     default:
-      throw new BadRequestException(
+      throw new RemoteServerException(
         `Type ${remoteServerType} is not supported.`,
+        RemoteServerExceptionCode.INVALID_REMOTE_SERVER_INPUT,
       );
   }
 };
diff --git a/packages/twenty-server/src/engine/metadata-modules/utils/__tests__/validate-metadata-name.spec.ts b/packages/twenty-server/src/engine/metadata-modules/utils/__tests__/validate-metadata-name.spec.ts
index d2e03eac6..1533d0ce6 100644
--- a/packages/twenty-server/src/engine/metadata-modules/utils/__tests__/validate-metadata-name.spec.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/utils/__tests__/validate-metadata-name.spec.ts
@@ -1,5 +1,7 @@
-import { InvalidStringException } from 'src/engine/metadata-modules/errors/InvalidStringException';
-import { validateMetadataName } from 'src/engine/metadata-modules/utils/validate-metadata-name.utils';
+import {
+  validateMetadataName,
+  InvalidStringException,
+} from 'src/engine/metadata-modules/utils/validate-metadata-name.utils';
 
 describe('validateMetadataName', () => {
   it('does not throw if string is valid', () => {
diff --git a/packages/twenty-server/src/engine/metadata-modules/utils/validate-metadata-name.utils.ts b/packages/twenty-server/src/engine/metadata-modules/utils/validate-metadata-name.utils.ts
index 16e8bfd56..0711863cd 100644
--- a/packages/twenty-server/src/engine/metadata-modules/utils/validate-metadata-name.utils.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/utils/validate-metadata-name.utils.ts
@@ -1,5 +1,3 @@
-import { InvalidStringException } from 'src/engine/metadata-modules/errors/InvalidStringException';
-
 const VALID_STRING_PATTERN = /^[a-z][a-zA-Z0-9]*$/;
 
 export const validateMetadataName = (string: string) => {
@@ -7,3 +5,11 @@ export const validateMetadataName = (string: string) => {
     throw new InvalidStringException(string);
   }
 };
+
+export class InvalidStringException extends Error {
+  constructor(string: string) {
+    const message = `String "${string}" is not valid`;
+
+    super(message);
+  }
+}
diff --git a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/basic-column-action.factory.ts b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/basic-column-action.factory.ts
index 093b3cba9..a22048718 100644
--- a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/basic-column-action.factory.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/basic-column-action.factory.ts
@@ -13,6 +13,10 @@ import { serializeDefaultValue } from 'src/engine/metadata-modules/field-metadat
 import { fieldMetadataTypeToColumnType } from 'src/engine/metadata-modules/workspace-migration/utils/field-metadata-type-to-column-type.util';
 import { ColumnActionAbstractFactory } from 'src/engine/metadata-modules/workspace-migration/factories/column-action-abstract.factory';
 import { computeColumnName } from 'src/engine/metadata-modules/field-metadata/utils/compute-column-name.util';
+import {
+  WorkspaceMigrationException,
+  WorkspaceMigrationExceptionCode,
+} from 'src/engine/metadata-modules/workspace-migration/workspace-migration.exception';
 
 export type BasicFieldMetadataType =
   | FieldMetadataType.UUID
@@ -66,8 +70,9 @@ export class BasicColumnActionFactory extends ColumnActionAbstractFactory<BasicF
       this.logger.error(
         `Column name not found for current or altered field metadata, can be due to a missing or an invalid target column map. Current column name: ${currentColumnName}, Altered column name: ${alteredColumnName}.`,
       );
-      throw new Error(
+      throw new WorkspaceMigrationException(
         `Column name not found for current or altered field metadata`,
+        WorkspaceMigrationExceptionCode.INVALID_FIELD_METADATA,
       );
     }
 
diff --git a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/column-action-abstract.factory.ts b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/column-action-abstract.factory.ts
index a56d3a8fd..0e600aa6f 100644
--- a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/column-action-abstract.factory.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/column-action-abstract.factory.ts
@@ -12,6 +12,10 @@ import {
   WorkspaceMigrationColumnAlter,
 } from 'src/engine/metadata-modules/workspace-migration/workspace-migration.entity';
 import { FieldMetadataType } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+import {
+  WorkspaceMigrationException,
+  WorkspaceMigrationExceptionCode,
+} from 'src/engine/metadata-modules/workspace-migration/workspace-migration.exception';
 
 export class ColumnActionAbstractFactory<
   T extends FieldMetadataType | 'default',
@@ -32,7 +36,10 @@ export class ColumnActionAbstractFactory<
         return this.handleCreateAction(alteredFieldMetadata, options);
       case WorkspaceMigrationColumnActionType.ALTER: {
         if (!currentFieldMetadata) {
-          throw new Error('current field metadata is required for alter');
+          throw new WorkspaceMigrationException(
+            'current field metadata is required for alter',
+            WorkspaceMigrationExceptionCode.INVALID_FIELD_METADATA,
+          );
         }
 
         return this.handleAlterAction(
@@ -43,8 +50,10 @@ export class ColumnActionAbstractFactory<
       }
       default: {
         this.logger.error(`Invalid action: ${action}`);
-
-        throw new Error('[AbstractFactory]: invalid action');
+        throw new WorkspaceMigrationException(
+          '[AbstractFactory]: invalid action',
+          WorkspaceMigrationExceptionCode.INVALID_ACTION,
+        );
       }
     }
   }
@@ -53,7 +62,10 @@ export class ColumnActionAbstractFactory<
     _fieldMetadata: FieldMetadataInterface<T>,
     _options?: WorkspaceColumnActionOptions,
   ): WorkspaceMigrationColumnCreate[] {
-    throw new Error('handleCreateAction method not implemented.');
+    throw new WorkspaceMigrationException(
+      'handleCreateAction method not implemented.',
+      WorkspaceMigrationExceptionCode.INVALID_ACTION,
+    );
   }
 
   protected handleAlterAction(
@@ -61,6 +73,9 @@ export class ColumnActionAbstractFactory<
     _alteredFieldMetadata: FieldMetadataInterface<T>,
     _options?: WorkspaceColumnActionOptions,
   ): WorkspaceMigrationColumnAlter[] {
-    throw new Error('handleAlterAction method not implemented.');
+    throw new WorkspaceMigrationException(
+      'handleAlterAction method not implemented.',
+      WorkspaceMigrationExceptionCode.INVALID_ACTION,
+    );
   }
 }
diff --git a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/composite-column-action.factory.ts b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/composite-column-action.factory.ts
index 5947ba2c9..a74bdd4e1 100644
--- a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/composite-column-action.factory.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/composite-column-action.factory.ts
@@ -13,6 +13,10 @@ import { fieldMetadataTypeToColumnType } from 'src/engine/metadata-modules/works
 import { ColumnActionAbstractFactory } from 'src/engine/metadata-modules/workspace-migration/factories/column-action-abstract.factory';
 import { computeCompositeColumnName } from 'src/engine/metadata-modules/field-metadata/utils/compute-column-name.util';
 import { compositeTypeDefintions } from 'src/engine/metadata-modules/field-metadata/composite-types';
+import {
+  WorkspaceMigrationException,
+  WorkspaceMigrationExceptionCode,
+} from 'src/engine/metadata-modules/workspace-migration/workspace-migration.exception';
 
 export type CompositeFieldMetadataType =
   | FieldMetadataType.ADDRESS
@@ -34,8 +38,9 @@ export class CompositeColumnActionFactory extends ColumnActionAbstractFactory<Co
       this.logger.error(
         `Composite type not found for field metadata type: ${fieldMetadata.type}`,
       );
-      throw new Error(
+      throw new WorkspaceMigrationException(
         `Composite type not found for field metadata type: ${fieldMetadata.type}`,
+        WorkspaceMigrationExceptionCode.INVALID_FIELD_METADATA,
       );
     }
 
@@ -74,8 +79,9 @@ export class CompositeColumnActionFactory extends ColumnActionAbstractFactory<Co
       this.logger.error(
         `Composite type not found for field metadata type: ${currentFieldMetadata.type} or ${alteredFieldMetadata.type}`,
       );
-      throw new Error(
+      throw new WorkspaceMigrationException(
         `Composite type not found for field metadata type: ${currentFieldMetadata.type} or ${alteredFieldMetadata.type}`,
+        WorkspaceMigrationExceptionCode.INVALID_FIELD_METADATA,
       );
     }
 
@@ -91,8 +97,9 @@ export class CompositeColumnActionFactory extends ColumnActionAbstractFactory<Co
         this.logger.error(
           `Current property not found for altered property: ${alteredProperty.name}`,
         );
-        throw new Error(
+        throw new WorkspaceMigrationException(
           `Current property not found for altered property: ${alteredProperty.name}`,
+          WorkspaceMigrationExceptionCode.INVALID_FIELD_METADATA,
         );
       }
 
diff --git a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/enum-column-action.factory.ts b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/enum-column-action.factory.ts
index 1007f41e6..939cc95b8 100644
--- a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/enum-column-action.factory.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/enum-column-action.factory.ts
@@ -13,6 +13,10 @@ import { serializeDefaultValue } from 'src/engine/metadata-modules/field-metadat
 import { fieldMetadataTypeToColumnType } from 'src/engine/metadata-modules/workspace-migration/utils/field-metadata-type-to-column-type.util';
 import { ColumnActionAbstractFactory } from 'src/engine/metadata-modules/workspace-migration/factories/column-action-abstract.factory';
 import { computeColumnName } from 'src/engine/metadata-modules/field-metadata/utils/compute-column-name.util';
+import {
+  WorkspaceMigrationException,
+  WorkspaceMigrationExceptionCode,
+} from 'src/engine/metadata-modules/workspace-migration/workspace-migration.exception';
 
 export type EnumFieldMetadataType =
   | FieldMetadataType.RATING
@@ -82,8 +86,9 @@ export class EnumColumnActionFactory extends ColumnActionAbstractFactory<EnumFie
       this.logger.error(
         `Column name not found for current or altered field metadata, can be due to a missing or an invalid target column map. Current column name: ${currentColumnName}, Altered column name: ${alteredColumnName}.`,
       );
-      throw new Error(
+      throw new WorkspaceMigrationException(
         `Column name not found for current or altered field metadata`,
+        WorkspaceMigrationExceptionCode.INVALID_FIELD_METADATA,
       );
     }
 
diff --git a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/utils/field-metadata-type-to-column-type.util.ts b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/utils/field-metadata-type-to-column-type.util.ts
index f3999fd7f..62e6a7e3e 100644
--- a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/utils/field-metadata-type-to-column-type.util.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/utils/field-metadata-type-to-column-type.util.ts
@@ -1,4 +1,8 @@
 import { FieldMetadataType } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+import {
+  WorkspaceMigrationException,
+  WorkspaceMigrationExceptionCode,
+} from 'src/engine/metadata-modules/workspace-migration/workspace-migration.exception';
 
 export const fieldMetadataTypeToColumnType = <Type extends FieldMetadataType>(
   fieldMetadataType: Type,
@@ -34,6 +38,9 @@ export const fieldMetadataTypeToColumnType = <Type extends FieldMetadataType>(
     case FieldMetadataType.RAW_JSON:
       return 'jsonb';
     default:
-      throw new Error(`Cannot convert ${fieldMetadataType} to column type.`);
+      throw new WorkspaceMigrationException(
+        `Cannot convert ${fieldMetadataType} to column type.`,
+        WorkspaceMigrationExceptionCode.INVALID_FIELD_METADATA,
+      );
   }
 };
diff --git a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/workspace-migration.exception.ts b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/workspace-migration.exception.ts
new file mode 100644
index 000000000..6340aeaa2
--- /dev/null
+++ b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/workspace-migration.exception.ts
@@ -0,0 +1,14 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class WorkspaceMigrationException extends CustomException {
+  code: WorkspaceMigrationExceptionCode;
+  constructor(message: string, code: WorkspaceMigrationExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum WorkspaceMigrationExceptionCode {
+  NO_FACTORY_FOUND = 'NO_FACTORY_FOUND',
+  INVALID_ACTION = 'INVALID_ACTION',
+  INVALID_FIELD_METADATA = 'INVALID_FIELD_METADATA',
+}
diff --git a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/workspace-migration.factory.ts b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/workspace-migration.factory.ts
index 6b3697294..6a62f3b6b 100644
--- a/packages/twenty-server/src/engine/metadata-modules/workspace-migration/workspace-migration.factory.ts
+++ b/packages/twenty-server/src/engine/metadata-modules/workspace-migration/workspace-migration.factory.ts
@@ -12,6 +12,10 @@ import {
 import { BasicColumnActionFactory } from 'src/engine/metadata-modules/workspace-migration/factories/basic-column-action.factory';
 import { EnumColumnActionFactory } from 'src/engine/metadata-modules/workspace-migration/factories/enum-column-action.factory';
 import { CompositeColumnActionFactory } from 'src/engine/metadata-modules/workspace-migration/factories/composite-column-action.factory';
+import {
+  WorkspaceMigrationException,
+  WorkspaceMigrationExceptionCode,
+} from 'src/engine/metadata-modules/workspace-migration/workspace-migration.exception';
 
 @Injectable()
 export class WorkspaceMigrationFactory {
@@ -131,7 +135,10 @@ export class WorkspaceMigrationFactory {
         undefinedOrAlteredFieldMetadata,
       );
 
-      throw new Error(`No field metadata provided for action ${action}`);
+      throw new WorkspaceMigrationException(
+        `No field metadata provided for action ${action}`,
+        WorkspaceMigrationExceptionCode.INVALID_ACTION,
+      );
     }
 
     const columnActions = this.createColumnAction(
@@ -161,7 +168,10 @@ export class WorkspaceMigrationFactory {
         },
       );
 
-      throw new Error(`No factory found for type ${alteredFieldMetadata.type}`);
+      throw new WorkspaceMigrationException(
+        `No factory found for type ${alteredFieldMetadata.type}`,
+        WorkspaceMigrationExceptionCode.NO_FACTORY_FOUND,
+      );
     }
 
     return factory.create(
diff --git a/packages/twenty-server/src/engine/utils/graphql-errors.util.ts b/packages/twenty-server/src/engine/utils/graphql-errors.util.ts
index a33cec928..613225796 100644
--- a/packages/twenty-server/src/engine/utils/graphql-errors.util.ts
+++ b/packages/twenty-server/src/engine/utils/graphql-errors.util.ts
@@ -183,3 +183,11 @@ export class TimeoutError extends BaseGraphQLError {
     Object.defineProperty(this, 'name', { value: 'TimeoutError' });
   }
 }
+
+export class InternalServerError extends BaseGraphQLError {
+  constructor(message: string) {
+    super(message, ErrorCode.INTERNAL_SERVER_ERROR);
+
+    Object.defineProperty(this, 'name', { value: 'InternalServerError' });
+  }
+}
diff --git a/packages/twenty-server/src/utils/custom-exception.ts b/packages/twenty-server/src/utils/custom-exception.ts
new file mode 100644
index 000000000..e12d8840c
--- /dev/null
+++ b/packages/twenty-server/src/utils/custom-exception.ts
@@ -0,0 +1,8 @@
+export class CustomException extends Error {
+  code: string;
+
+  constructor(message: string, code: string) {
+    super(message);
+    this.code = code;
+  }
+}