store: normalize ids in telegram_file and add index

pkg/connector/store/upgrades/00-latest.sql

@@ -1,4 +1,4 @@
--- v0 -> v6 (compatible with v2+): Latest revision
+-- v0 -> v7 (compatible with v2+): Latest revision
 
 CREATE TABLE telegram_user_state (
     user_id BIGINT NOT NULL PRIMARY KEY,
@@ -52,6 +52,8 @@ CREATE TABLE telegram_file (
     size      BIGINT
 );
 
+CREATE INDEX telegram_file_mxc_idx ON telegram_file (mxc);
+
 CREATE TABLE telegram_topic (
     channel_id BIGINT NOT NULL,
     topic_id   BIGINT NOT NULL,

pkg/connector/store/upgrades/07-telegram-file-fixes.sql

@@ -0,0 +1,3 @@
+-- v7 (compatible with v2+): Add index and fix values in telegram_file
+UPDATE telegram_file SET id=REPLACE(id, '-', '') WHERE id LIKE '%-';
+CREATE INDEX telegram_file_mxc_idx ON telegram_file (mxc);