diff --git a/internal/repository/migrations/sqlite3/09_add-job-cache.up.sql b/internal/repository/migrations/sqlite3/09_add-job-cache.up.sql
index 82e8d15..863b50e 100644
--- a/internal/repository/migrations/sqlite3/09_add-job-cache.up.sql
+++ b/internal/repository/migrations/sqlite3/09_add-job-cache.up.sql
@@ -227,4 +227,5 @@ CREATE INDEX IF NOT EXISTS jobs_energy_starttime ON job (energy, start_time);
 PRAGMA optimize;
 
 -- Optimize DB size: https://sqlite.org/lang_vacuum.html 
-VACUUM;
\ No newline at end of file
+-- Not allowed within a migration transaction; Keep command here for documentation and recommendation
+-- Command: 'VACUUM;'
\ No newline at end of file