agent: add index to file redirect migration (#988)

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20240124_file_redirect.hs

@@ -15,11 +15,15 @@ ALTER TABLE rcv_files ADD COLUMN redirect_id INTEGER REFERENCES rcv_files ON DEL
 ALTER TABLE rcv_files ADD COLUMN redirect_entity_id BLOB;
 ALTER TABLE rcv_files ADD COLUMN redirect_size INTEGER;
 ALTER TABLE rcv_files ADD COLUMN redirect_digest BLOB;
+
+CREATE INDEX idx_rcv_files_redirect_id on rcv_files(redirect_id);
 |]
 
 down_m20240124_file_redirect :: Query
 down_m20240124_file_redirect =
     [sql|
+DROP INDEX idx_rcv_files_redirect_id;
+
 ALTER TABLE snd_files DROP COLUMN redirect_size;
 ALTER TABLE snd_files DROP COLUMN redirect_digest;
 

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/agent_schema.sql

@@ -514,3 +514,4 @@ CREATE INDEX idx_snd_message_deliveries_expired ON snd_message_deliveries(
   failed,
   internal_id
 );
+CREATE INDEX idx_rcv_files_redirect_id on rcv_files(redirect_id);