fix: Migration 028 robuster (section_progress UPDATE via DO-Block mit IF EXISTS)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend-compliance/migrations/028_dsfa_ai_use_cases.sql

@@ -5,8 +5,18 @@ ALTER TABLE compliance.compliance_dsfas
   ADD COLUMN IF NOT EXISTS ai_use_case_modules JSONB DEFAULT '[]'::jsonb,
   ADD COLUMN IF NOT EXISTS section_8_complete BOOLEAN DEFAULT FALSE;
 
--- Extend section_progress JSONB for existing rows
-UPDATE compliance.compliance_dsfas
-SET section_progress = section_progress || '{"section_8_complete": false}'::jsonb
-WHERE section_progress IS NOT NULL
+-- Extend section_progress JSONB for existing rows (only if column exists)
+DO $$
+BEGIN
+  IF EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_schema = 'compliance'
+      AND table_name = 'compliance_dsfas'
+      AND column_name = 'section_progress'
+  ) THEN
+    UPDATE compliance.compliance_dsfas
+    SET section_progress = section_progress || '{"section_8_complete": false}'::jsonb
+    WHERE section_progress IS NOT NULL
       AND NOT (section_progress ? 'section_8_complete');
+  END IF;
+END $$;