refac/enh: add performance indexes

Co-Authored-By: decent-engineer-decent-datascientist <77806775+decent-engineer-decent-datascientist@users.noreply.github.com>

backend/open_webui/migrations/versions/018012973d35_add_indexes.py

@@ -0,0 +1,46 @@
+"""Add indexes
+
+Revision ID: 018012973d35
+Revises: d31026856c01
+Create Date: 2025-08-13 03:00:00.000000
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "018012973d35"
+down_revision = "d31026856c01"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Chat table indexes
+    op.create_index("folder_id_idx", "chat", ["folder_id"])
+    op.create_index("user_id_pinned_idx", "chat", ["user_id", "pinned"])
+    op.create_index("user_id_archived_idx", "chat", ["user_id", "archived"])
+    op.create_index("updated_at_user_id_idx", "chat", ["updated_at", "user_id"])
+    op.create_index("folder_id_user_id_idx", "chat", ["folder_id", "user_id"])
+
+    # Tag table index
+    op.create_index("user_id_idx", "tag", ["user_id"])
+
+    # Function table index
+    op.create_index("is_global_idx", "function", ["is_global"])
+
+
+def downgrade():
+    # Chat table indexes
+    op.drop_index("folder_id_idx", table_name="chat")
+    op.drop_index("user_id_pinned_idx", table_name="chat")
+    op.drop_index("user_id_archived_idx", table_name="chat")
+    op.drop_index("updated_at_user_id_idx", table_name="chat")
+    op.drop_index("folder_id_user_id_idx", table_name="chat")
+
+    # Tag table index
+    op.drop_index("user_id_idx", table_name="tag")
+
+    # Function table index
+
+    op.drop_index("is_global_idx", table_name="function")