fix: revert V27 checksum + add V35 for generated_reports timestamps

V27 was modified after it was applied on production, causing a Flyway
checksum mismatch. Reverted V27 to original and moved the created_at/
updated_at columns to a new V35 migration.

cannamanage-api/src/main/resources/db/migration/V27__generated_reports.sql

@@ -10,9 +10,7 @@ CREATE TABLE generated_reports (
     storage_path VARCHAR(500),
     parameters JSONB,
     generated_by UUID NOT NULL REFERENCES users(id),
-    generated_at TIMESTAMP DEFAULT NOW(),
-    created_at TIMESTAMP DEFAULT NOW(),
-    updated_at TIMESTAMP DEFAULT NOW()
+    generated_at TIMESTAMP DEFAULT NOW()
 );
 
 CREATE INDEX idx_generated_reports_tenant ON generated_reports(tenant_id);

cannamanage-api/src/main/resources/db/migration/V35__generated_reports_add_timestamps.sql

@@ -0,0 +1,3 @@
+-- Add created_at and updated_at to generated_reports (split from V27 to avoid checksum mismatch)
+ALTER TABLE generated_reports ADD COLUMN IF NOT EXISTS created_at TIMESTAMP DEFAULT NOW();
+ALTER TABLE generated_reports ADD COLUMN IF NOT EXISTS updated_at TIMESTAMP DEFAULT NOW();