perf(db): index activity_events by (event_type, created_at)

backend/migrations/versions/bbd5bbb26d97_merge_heads.py

@@ -0,0 +1,26 @@
+"""merge heads
+
+Revision ID: bbd5bbb26d97
+Revises: 99cd6df95f85, b4338be78eec
+Create Date: 2026-02-12 09:54:21.149702
+
+"""
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'bbd5bbb26d97'
+down_revision = ('99cd6df95f85', 'b4338be78eec')
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    pass
+
+
+def downgrade() -> None:
+    pass