diff --git a/schema/mysql-migrations/upgrade_188.sql b/schema/mysql-migrations/upgrade_188.sql
index 1c016195d..d3b916bbc 100644
--- a/schema/mysql-migrations/upgrade_188.sql
+++ b/schema/mysql-migrations/upgrade_188.sql
@@ -1,12 +1,17 @@
+ALTER TABLE director_generated_config
+  DROP FOREIGN KEY director_generated_config_activity;
+
+# Delete all entries with duplicate checksum except the first entry
+DELETE log1 FROM director_activity_log log1
+  INNER JOIN director_activity_log log2 ON log1.checksum = log2.checksum
+  WHERE log1.id > log2.id;
+
 ALTER TABLE director_activity_log
 DROP INDEX checksum,
 ADD UNIQUE INDEX checksum (checksum);
 
 ALTER TABLE director_generated_config
-DROP FOREIGN KEY director_generated_config_activity;
-
-ALTER TABLE director_generated_config
-ADD CONSTRAINT director_generated_config_activity
+  ADD CONSTRAINT director_generated_config_activity
     FOREIGN KEY (last_activity_checksum)
     REFERENCES director_activity_log (checksum)
     ON DELETE RESTRICT