Simplify database migrations

ts/sql/migrations/49-fix-preview-index.ts

@@ -3,31 +3,15 @@
 
 import type { Database } from '@signalapp/sqlcipher';
 
-import type { LoggerType } from '../../types/Logging';
+export default function updateToSchemaVersion49(db: Database): void {
+  db.exec(
+    `
+    DROP INDEX messages_preview;
 
-export default function updateToSchemaVersion49(
-  currentVersion: number,
-  db: Database,
-  logger: LoggerType
-): void {
-  if (currentVersion >= 49) {
-    return;
-  }
-
-  db.transaction(() => {
-    db.exec(
-      `
-      DROP INDEX messages_preview;
-
-      -- Note the omitted 'expiresAt' column in the index. If it is present
-      -- sqlite can't ORDER BY received_at, sent_at using this index.
-      CREATE INDEX messages_preview ON messages
-        (conversationId, shouldAffectPreview, isGroupLeaveEventFromOther, received_at, sent_at);
-      `
-    );
-
-    db.pragma('user_version = 49');
-  })();
-
-  logger.info('updateToSchemaVersion49: success!');
+    -- Note the omitted 'expiresAt' column in the index. If it is present
+    -- sqlite can't ORDER BY received_at, sent_at using this index.
+    CREATE INDEX messages_preview ON messages
+      (conversationId, shouldAffectPreview, isGroupLeaveEventFromOther, received_at, sent_at);
+    `
+  );
 }