feat: search functionality

backend/migrations/versions/b7e3d9f1a4c6_fts_tsvector_gin.py

@@ -0,0 +1,32 @@
+"""fts expression gin on messages and media
+
+Revision ID: b7e3d9f1a4c6
+Revises: a1d4f7c2e9b8
+Create Date: 2026-05-29 22:30:00.000000
+
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+revision: str = "b7e3d9f1a4c6"
+down_revision: str | None = "a1d4f7c2e9b8"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.execute(
+        "CREATE INDEX ix_messages_tsv ON messages USING gin "
+        "(to_tsvector('russian', coalesce(text, '')))"
+    )
+    op.execute(
+        "CREATE INDEX ix_media_tsv ON media USING gin "
+        "(to_tsvector('russian', coalesce(extracted_text, '')))"
+    )
+
+
+def downgrade() -> None:
+    op.execute("DROP INDEX IF EXISTS ix_media_tsv")
+    op.execute("DROP INDEX IF EXISTS ix_messages_tsv")