added some scripts for the sqlite db for cleanup

run/db_event_delete_duplicates.ts

@@ -0,0 +1,10 @@
+import * as db from "../src/sql";
+
+const query = db.db.query(`DELETE FROM events
+WHERE rowid NOT IN (
+  SELECT MIN(rowid)
+  FROM events
+  GROUP BY uid
+);`);
+
+query.run();