perf(backend): search stays in tens of milliseconds at archive size for rare words, channels, deleted and transcripts

backend/migrations/versions/d8f1a6c3e5b7_message_search.py

@@ -1,7 +1,7 @@
 """message search index outside the hypertable, versions searchable
 
 Revision ID: d8f1a6c3e5b7
-Revises: c9e2a7f4b1d8
+Revises: c5e7a9b1d3f6
 Create Date: 2026-10-19 03:00:00.000000
 
 """
@@ -11,7 +11,7 @@ from collections.abc import Sequence
 from alembic import op
 
 revision: str = "d8f1a6c3e5b7"
-down_revision: str | None = "c9e2a7f4b1d8"
+down_revision: str | None = "c5e7a9b1d3f6"
 branch_labels: str | Sequence[str] | None = None
 depends_on: str | Sequence[str] | None = None
 
@@ -95,6 +95,13 @@ def upgrade() -> None:
         "CREATE INDEX ix_message_search_sender ON message_search "
         "(account_id, sender_id, date DESC)"
     )
+    for flag in ("deleted", "edited"):
+        op.execute(
+            f"CREATE INDEX ix_message_search_{flag} ON message_search "
+            "(account_id, date DESC, chat_id DESC, message_id DESC) "
+            f"WHERE {flag}_at IS NOT NULL"
+        )
+    op.execute("ALTER TABLE message_search ALTER COLUMN tsv SET STATISTICS 1000")
     op.execute(_SYNC)
     op.execute(
         "CREATE TRIGGER messages_search_insert AFTER INSERT ON messages "
@@ -117,6 +124,9 @@ def upgrade() -> None:
         "CREATE INDEX ix_media_tsv ON media USING gin (search_vector(extracted_text))"
     )
     op.execute("DROP INDEX IF EXISTS ix_messages_tsv")
+    for index in ("ix_message_versions_tsv", "ix_media_tsv"):
+        op.execute(f"ALTER INDEX {index} ALTER COLUMN 1 SET STATISTICS 1000")
+    op.execute("ANALYZE message_search, message_versions, media")
 
 
 def downgrade() -> None: