core: rcv file events (#2002)

src/Simplex/Chat/Migrations/M20230304_file_description.hs

@@ -28,8 +28,12 @@ ALTER TABLE files ADD COLUMN private_snd_file_descr TEXT NULL;
 ALTER TABLE snd_files ADD COLUMN file_descr_id INTEGER NULL
   REFERENCES xftp_file_descriptions ON DELETE SET NULL;
 
+CREATE INDEX idx_snd_files_file_descr_id ON snd_files(file_descr_id);
+
 ALTER TABLE rcv_files ADD COLUMN file_descr_id INTEGER NULL
   REFERENCES xftp_file_descriptions ON DELETE SET NULL;
 
+CREATE INDEX idx_rcv_files_file_descr_id ON rcv_files(file_descr_id);
+
 ALTER TABLE rcv_files ADD COLUMN agent_rcv_file_id BLOB NULL;
 |]

src/Simplex/Chat/Migrations/chat_schema.sql

@@ -567,3 +567,5 @@ CREATE TABLE xftp_file_descriptions(
   created_at TEXT NOT NULL DEFAULT(datetime('now')),
   updated_at TEXT NOT NULL DEFAULT(datetime('now'))
 );
+CREATE INDEX idx_snd_files_file_descr_id ON snd_files(file_descr_id);
+CREATE INDEX idx_rcv_files_file_descr_id ON rcv_files(file_descr_id);