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migrations/postgres/000003_write_points_simplify.up.sql

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+-- Write points use one explicit permission switch; keep the previous
+-- effective permission before removing the redundant columns. The guard
+-- keeps startup migrations safe when the service is restarted.
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1
+        FROM information_schema.columns
+        WHERE table_schema = current_schema()
+          AND table_name = 'write_points'
+          AND column_name = 'enabled'
+    ) THEN
+        EXECUTE 'UPDATE write_points SET write_enabled = enabled AND write_enabled WHERE enabled IS NOT NULL';
+        EXECUTE 'ALTER TABLE write_points DROP COLUMN enabled';
+    END IF;
+
+    IF EXISTS (
+        SELECT 1
+        FROM information_schema.columns
+        WHERE table_schema = current_schema()
+          AND table_name = 'write_points'
+          AND column_name = 'readback_tolerance'
+    ) THEN
+        EXECUTE 'ALTER TABLE write_points DROP COLUMN readback_tolerance';
+    END IF;
+END $$;