Add IF NOT EXISTS / IF EXISTS guards to migration

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: davidercruz

src/migration/1770812936388-AddRejectionClassificationToOpportunityMatch.ts

@@ -8,14 +8,14 @@ export class AddRejectionClassificationToOpportunityMatch1770812936388
   public async up(queryRunner: QueryRunner): Promise<void> {
     await queryRunner.query(
       `ALTER TABLE "opportunity_match"
-       ADD "rejectionClassification" jsonb`,
+       ADD COLUMN IF NOT EXISTS "rejectionClassification" jsonb`,
     );
   }
 
   public async down(queryRunner: QueryRunner): Promise<void> {
     await queryRunner.query(
       `ALTER TABLE "opportunity_match"
-       DROP COLUMN "rejectionClassification"`,
+       DROP COLUMN IF EXISTS "rejectionClassification"`,
     );
   }
 }