diff --git a/app/models.py b/app/models.py
index e0a544bf..5adf59ca 100644
--- a/app/models.py
+++ b/app/models.py
@@ -423,7 +423,7 @@ class Community(db.Model):
     posting_warning = db.Column(db.String(512))
 
     ap_id = db.Column(db.String(255), index=True)
-    ap_profile_id = db.Column(db.String(255), index=True)
+    ap_profile_id = db.Column(db.String(255), index=True, unique=True)
     ap_followers_url = db.Column(db.String(255))
     ap_preferred_username = db.Column(db.String(255))
     ap_discoverable = db.Column(db.Boolean, default=False)
diff --git a/migrations/versions/d2bd6281a8d3_unique_community_ap_profile_id.py b/migrations/versions/d2bd6281a8d3_unique_community_ap_profile_id.py
new file mode 100644
index 00000000..7e507eda
--- /dev/null
+++ b/migrations/versions/d2bd6281a8d3_unique_community_ap_profile_id.py
@@ -0,0 +1,77 @@
+"""unique community ap profile id
+
+Revision ID: d2bd6281a8d3
+Revises: d32ef1893ce4
+Create Date: 2024-11-19 18:34:47.914982
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy import text
+
+
+# revision identifiers, used by Alembic.
+revision = 'd2bd6281a8d3'
+down_revision = 'd32ef1893ce4'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Find duplicate communities by ap_profile_id
+    dupes_query = text('''
+            SELECT ap_profile_id FROM "community" 
+            GROUP BY ap_profile_id 
+            HAVING COUNT(*) > 1
+        ''')
+
+    conn = op.get_bind()
+    duplicate_profiles = conn.execute(dupes_query).scalars()
+    print('Cleaning up duplicate communities, this may take a while...')
+
+    for profile_id in duplicate_profiles:
+        if profile_id is None:
+            continue
+        # Get all communities with the same ap_profile_id, ordered by ID
+        users_query = text('''
+                SELECT id FROM "community" 
+                WHERE ap_profile_id = :ap_profile_id 
+                ORDER BY id
+            ''')
+        users = conn.execute(users_query, {"ap_profile_id": profile_id}).fetchall()
+
+        # Set the lowest ID as the new_id, and collect other IDs to update/delete
+        new_id = users[0].id
+        old_ids = [user.id for user in users[1:]]
+
+        print(profile_id)
+
+        if old_ids:
+            # Update tables with batch IN clause
+            conn.execute(text('UPDATE "post" SET community_id = :new_id WHERE community_id IN :old_ids'), {"new_id": new_id, "old_ids": tuple(old_ids)})
+            conn.execute(text('UPDATE "post_reply" SET community_id = :new_id WHERE community_id IN :old_ids'), {"new_id": new_id, "old_ids": tuple(old_ids)})
+            conn.execute(text('UPDATE "report" SET suspect_community_id = :new_id WHERE suspect_community_id IN :old_ids'), {"new_id": new_id, "old_ids": tuple(old_ids)})
+            conn.execute(text('UPDATE "report" SET in_community_id = :new_id WHERE in_community_id IN :old_ids'), {"new_id": new_id, "old_ids": tuple(old_ids)})
+            conn.execute(text('UPDATE "mod_log" SET community_id = :new_id WHERE community_id IN :old_ids'), {"new_id": new_id, "old_ids": tuple(old_ids)})
+            conn.execute(text('DELETE FROM "community_block" WHERE community_id IN :old_ids'), {"old_ids": tuple(old_ids)})
+            conn.execute(text('DELETE FROM "community_member" WHERE community_id IN :old_ids'), {"old_ids": tuple(old_ids)})
+            conn.execute(text('DELETE FROM "community_ban" WHERE community_id IN :old_ids'), {"old_ids": tuple(old_ids)})
+            conn.execute(text('DELETE FROM "community_join_request" WHERE community_id IN :old_ids'), {"old_ids": tuple(old_ids)})
+
+            # Delete the duplicate users
+            conn.execute(text('DELETE FROM "community" WHERE id IN :old_ids'), {"old_ids": tuple(old_ids)})
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('community', schema=None) as batch_op:
+        batch_op.drop_index('ix_community_ap_profile_id')
+        batch_op.create_index(batch_op.f('ix_community_ap_profile_id'), ['ap_profile_id'], unique=True)
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('community', schema=None) as batch_op:
+        batch_op.drop_index(batch_op.f('ix_community_ap_profile_id'))
+        batch_op.create_index('ix_community_ap_profile_id', ['ap_profile_id'], unique=False)
+
+    # ### end Alembic commands ###