diff --git a/packages/backend/src/models/entities/drive-file.ts b/packages/backend/src/models/entities/drive-file.ts
index c81d5d7622..e3a7d1c370 100644
--- a/packages/backend/src/models/entities/drive-file.ts
+++ b/packages/backend/src/models/entities/drive-file.ts
@@ -23,7 +23,6 @@ export class DriveFile {
 	@PrimaryColumn(id())
 	public id: string;
 
-	@Index()
 	@Column("timestamp without time zone", {
 		comment: "The created date of the DriveFile.",
 	})
@@ -147,7 +146,6 @@ export class DriveFile {
 	})
 	public webpublicAccessKey: string | null;
 
-	@Index()
 	@Column("varchar", {
 		length: 512,
 		nullable: true,
diff --git a/packages/backend/src/models/entities/hashtag.ts b/packages/backend/src/models/entities/hashtag.ts
index 7b3df1cc22..84d817bcd2 100644
--- a/packages/backend/src/models/entities/hashtag.ts
+++ b/packages/backend/src/models/entities/hashtag.ts
@@ -19,7 +19,6 @@ export class Hashtag {
 	})
 	public mentionedUserIds: User["id"][];
 
-	@Index()
 	@Column("integer", {
 		default: 0,
 	})
@@ -43,7 +42,6 @@ export class Hashtag {
 	})
 	public mentionedRemoteUserIds: User["id"][];
 
-	@Index()
 	@Column("integer", {
 		default: 0,
 	})
@@ -55,7 +53,6 @@ export class Hashtag {
 	})
 	public attachedUserIds: User["id"][];
 
-	@Index()
 	@Column("integer", {
 		default: 0,
 	})
diff --git a/packages/backend/src/models/entities/note-reaction.ts b/packages/backend/src/models/entities/note-reaction.ts
index fc57bb6a07..1d2fc567b5 100644
--- a/packages/backend/src/models/entities/note-reaction.ts
+++ b/packages/backend/src/models/entities/note-reaction.ts
@@ -17,7 +17,6 @@ export class NoteReaction {
 	@PrimaryColumn(id())
 	public id: string;
 
-	@Index()
 	@Column("timestamp without time zone", {
 		comment: "The created date of the NoteReaction.",
 	})
diff --git a/packages/backend/src/models/entities/note.ts b/packages/backend/src/models/entities/note.ts
index 94cd8c7b66..3b7315288e 100644
--- a/packages/backend/src/models/entities/note.ts
+++ b/packages/backend/src/models/entities/note.ts
@@ -139,7 +139,6 @@ export class Note {
 
 	// FIXME: file id is not removed from this array even if the file is deleted
 	// TODO: drop this column and use note_files
-	@Index()
 	@Column({
 		...id(),
 		array: true,
@@ -147,7 +146,6 @@ export class Note {
 	})
 	public fileIds: DriveFile["id"][];
 
-	@Index()
 	@Column("varchar", {
 		length: 256,
 		array: true,
@@ -163,7 +161,6 @@ export class Note {
 	})
 	public visibleUserIds: User["id"][];
 
-	@Index()
 	@Column({
 		...id(),
 		array: true,
@@ -184,7 +181,6 @@ export class Note {
 	})
 	public emojis: string[];
 
-	@Index()
 	@Column("varchar", {
 		length: 128,
 		array: true,
diff --git a/packages/backend/src/models/entities/notification.ts b/packages/backend/src/models/entities/notification.ts
index 58fc86a72c..57a2a59158 100644
--- a/packages/backend/src/models/entities/notification.ts
+++ b/packages/backend/src/models/entities/notification.ts
@@ -20,7 +20,6 @@ export class Notification {
 	@PrimaryColumn(id())
 	public id: string;
 
-	@Index()
 	@Column("timestamp without time zone", {
 		comment: "The created date of the Notification.",
 	})
diff --git a/packages/backend/src/models/entities/poll.ts b/packages/backend/src/models/entities/poll.ts
index 3cc6df17cf..9ef2091566 100644
--- a/packages/backend/src/models/entities/poll.ts
+++ b/packages/backend/src/models/entities/poll.ts
@@ -44,14 +44,12 @@ export class Poll {
 	})
 	public noteVisibility: (typeof noteVisibilities)[number];
 
-	@Index()
 	@Column({
 		...id(),
 		comment: "[Denormalized]",
 	})
 	public userId: User["id"];
 
-	@Index()
 	@Column("varchar", {
 		length: 512,
 		nullable: true,
diff --git a/packages/backend/src/models/entities/user.ts b/packages/backend/src/models/entities/user.ts
index 69a2b4dc27..ad86e72422 100644
--- a/packages/backend/src/models/entities/user.ts
+++ b/packages/backend/src/models/entities/user.ts
@@ -116,7 +116,6 @@ export class User {
 	})
 	public bannerId: DriveFile["id"] | null;
 
-	@Index()
 	@Column("varchar", {
 		length: 128,
 		array: true,