diff --git a/backend/v3/storage/database/dialect/postgres/error.go b/backend/v3/storage/database/dialect/postgres/error.go
index a16d885fa1..3edbf0692c 100644
--- a/backend/v3/storage/database/dialect/postgres/error.go
+++ b/backend/v3/storage/database/dialect/postgres/error.go
@@ -20,13 +20,17 @@ func wrapError(err error) error {
 		return database.NewUnknownError(err)
 	}
 	switch pgxErr.Code {
-	case "23514": // check_violation
+	// 23514: check_violation - A value violates a CHECK constraint.
+	case "23514":
 		return database.NewCheckError(pgxErr.TableName, pgxErr.ConstraintName, pgxErr)
-	case "23505": // unique_violation
+	// 23505: unique_violation - A value violates a UNIQUE constraint.
+	case "23505":
 		return database.NewUniqueError(pgxErr.TableName, pgxErr.ConstraintName, pgxErr)
-	case "23503": // foreign_key_violation
+	// 23503: foreign_key_violation - A value violates a foreign key constraint.
+	case "23503":
 		return database.NewForeignKeyError(pgxErr.TableName, pgxErr.ConstraintName, pgxErr)
-	case "23502": // not_null_violation
+	// 23502: not_null_violation - A value violates a NOT NULL constraint.
+	case "23502":
 		return database.NewNotNullError(pgxErr.TableName, pgxErr.ConstraintName, pgxErr)
 	}
 	return database.NewUnknownError(err)