diff --git a/server/entity/LinkedAccount.ts b/server/entity/LinkedAccount.ts
index fba4edbc8..6bd251107 100644
--- a/server/entity/LinkedAccount.ts
+++ b/server/entity/LinkedAccount.ts
@@ -1,6 +1,15 @@
-import { Column, Entity, ManyToOne, PrimaryGeneratedColumn } from 'typeorm';
+import {
+  Column,
+  Entity,
+  Index,
+  ManyToOne,
+  PrimaryGeneratedColumn,
+} from 'typeorm';
 import { User } from './User';
 
+@Index('IDX_linked_accounts_provider_sub', ['provider', 'sub'], {
+  unique: true,
+})
 @Entity('linked_accounts')
 export class LinkedAccount {
   constructor(options: Omit<LinkedAccount, 'id'>) {
@@ -10,6 +19,7 @@ export class LinkedAccount {
   @PrimaryGeneratedColumn()
   id: number;
 
+  @Index()
   @ManyToOne(() => User, (user) => user.linkedAccounts, { onDelete: 'CASCADE' })
   user: User;
 
diff --git a/server/migration/postgres/1742858617989-AddLinkedAccount.ts b/server/migration/postgres/1742858617989-AddLinkedAccount.ts
index c24acc388..dfb7567a4 100644
--- a/server/migration/postgres/1742858617989-AddLinkedAccount.ts
+++ b/server/migration/postgres/1742858617989-AddLinkedAccount.ts
@@ -10,9 +10,21 @@ export class AddLinkedAccount1742858617989 implements MigrationInterface {
     await queryRunner.query(
       `ALTER TABLE "linked_accounts" ADD CONSTRAINT "FK_2c77d2a0c06eeab6e62dc35af64" FOREIGN KEY ("userId") REFERENCES "user"("id") ON DELETE CASCADE ON UPDATE NO ACTION`
     );
+    await queryRunner.query(
+      `CREATE INDEX "IDX_2c77d2a0c06eeab6e62dc35af6" ON "linked_accounts" ("userId") `
+    );
+    await queryRunner.query(
+      `CREATE UNIQUE INDEX "IDX_linked_accounts_provider_sub" ON "linked_accounts" ("provider", "sub") `
+    );
   }
 
   public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `DROP INDEX "public"."IDX_linked_accounts_provider_sub"`
+    );
+    await queryRunner.query(
+      `DROP INDEX "public"."IDX_2c77d2a0c06eeab6e62dc35af6"`
+    );
     await queryRunner.query(
       `ALTER TABLE "linked_accounts" DROP CONSTRAINT "FK_2c77d2a0c06eeab6e62dc35af64"`
     );
diff --git a/server/migration/sqlite/1742858484395-AddLinkedAccounts.ts b/server/migration/sqlite/1742858484395-AddLinkedAccounts.ts
index 6161394fe..38b3dc372 100644
--- a/server/migration/sqlite/1742858484395-AddLinkedAccounts.ts
+++ b/server/migration/sqlite/1742858484395-AddLinkedAccounts.ts
@@ -7,9 +7,17 @@ export class AddLinkedAccounts1742858484395 implements MigrationInterface {
     await queryRunner.query(
       `CREATE TABLE "linked_accounts" ("id" integer PRIMARY KEY AUTOINCREMENT NOT NULL, "provider" varchar(255) NOT NULL, "sub" varchar(255) NOT NULL, "username" varchar NOT NULL, "userId" integer, CONSTRAINT "FK_2c77d2a0c06eeab6e62dc35af64" FOREIGN KEY ("userId") REFERENCES "user" ("id") ON DELETE CASCADE ON UPDATE NO ACTION)`
     );
+    await queryRunner.query(
+      `CREATE INDEX "IDX_2c77d2a0c06eeab6e62dc35af6" ON "linked_accounts" ("userId") `
+    );
+    await queryRunner.query(
+      `CREATE UNIQUE INDEX "IDX_linked_accounts_provider_sub" ON "linked_accounts" ("provider", "sub") `
+    );
   }
 
   public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`DROP INDEX "IDX_linked_accounts_provider_sub"`);
+    await queryRunner.query(`DROP INDEX "IDX_2c77d2a0c06eeab6e62dc35af6"`);
     await queryRunner.query(`DROP TABLE "linked_accounts"`);
   }
 }