Implement conditional column additions for Ballot table in migration

- Updated migration script to add 'anchorUrls' and 'anchorHashes' columns to the 'Ballot' table only if they do not already exist, ensuring idempotency of the migration.
- This change enhances the robustness of the migration process by preventing errors during execution if the columns are already present.

Author: QSchlegel

prisma/migrations/20250101000000_add_crowdfund_gov_extension_table/migration.sql

@@ -2,3 +2,6 @@
 -- The migration failed and has been marked as rolled back.
 -- If you need to recreate this migration, please check the database schema or git history.
 
+-- No-op migration (failed and rolled back)
+SELECT 1;
+

prisma/migrations/20250806050340_add_crowdfund/migration.sql

@@ -2,3 +2,6 @@
 -- The migration has been marked as applied in the database.
 -- If you need to recreate this migration, please check the database schema or git history.
 
+-- No-op migration (already applied)
+SELECT 1;
+

prisma/migrations/20250825090537_add_param_utxo/migration.sql

@@ -2,3 +2,6 @@
 -- The migration has been marked as applied in the database.
 -- If you need to recreate this migration, please check the database schema or git history.
 
+-- No-op migration (already applied)
+SELECT 1;
+

prisma/migrations/20250828113754_add_date_crowdfund/migration.sql

@@ -2,3 +2,6 @@
 -- The migration has been marked as applied in the database.
 -- If you need to recreate this migration, please check the database schema or git history.
 
+-- No-op migration (already applied)
+SELECT 1;
+

prisma/migrations/20250909122657_add_gov_crowdfund/migration.sql

@@ -2,3 +2,6 @@
 -- The migration has been marked as applied in the database.
 -- If you need to recreate this migration, please check the database schema or git history.
 
+-- No-op migration (already applied)
+SELECT 1;
+

prisma/migrations/20251113150348_add_ipfs_hash_table/migration.sql

@@ -2,3 +2,6 @@
 -- The migration has been marked as applied in the database.
 -- If you need to recreate this migration, please check the database schema or git history.
 
+-- No-op migration (already applied)
+SELECT 1;
+

prisma/migrations/20251128091925_add_gov_action_anchor_field/migration.sql

@@ -1,4 +1,17 @@
 -- AlterTable
-ALTER TABLE "Ballot" ADD COLUMN "anchorUrls" TEXT[],
-ADD COLUMN "anchorHashes" TEXT[];
+-- Add anchorUrls column if it doesn't exist
+DO $$ 
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name='Ballot' AND column_name='anchorUrls') THEN
+        ALTER TABLE "Ballot" ADD COLUMN "anchorUrls" TEXT[];
+    END IF;
+END $$;
+
+-- Add anchorHashes column if it doesn't exist
+DO $$ 
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name='Ballot' AND column_name='anchorHashes') THEN
+        ALTER TABLE "Ballot" ADD COLUMN "anchorHashes" TEXT[];
+    END IF;
+END $$;