Change schema_migrations version from TEXT to INTEGER

internal/database/schema/000.sql

@@ -2,8 +2,8 @@
 -- Applied as a bootstrap step before the normal migration loop.
 
 CREATE TABLE IF NOT EXISTS schema_migrations (
-    version TEXT PRIMARY KEY,
+    version INTEGER PRIMARY KEY,
     applied_at DATETIME DEFAULT CURRENT_TIMESTAMP
 );
 
-INSERT OR IGNORE INTO schema_migrations (version) VALUES ('000');
+INSERT OR IGNORE INTO schema_migrations (version) VALUES (0);