Add intensity-based preferences and harden E2EE payload verification

apps/supabase/migrations/20260108000000_add_intensity_levels.sql

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+-- Add intensity levels for content balance
+
+ALTER TABLE profiles
+ADD COLUMN IF NOT EXISTS max_intensity INTEGER DEFAULT 2
+CHECK (max_intensity >= 1 AND max_intensity <= 5);
+
+UPDATE profiles
+SET max_intensity = CASE
+  WHEN show_explicit_content IS TRUE THEN 5
+  ELSE 2
+END
+WHERE max_intensity IS NULL;
+
+ALTER TABLE question_packs
+ADD COLUMN IF NOT EXISTS min_intensity INTEGER,
+ADD COLUMN IF NOT EXISTS max_intensity INTEGER,
+ADD COLUMN IF NOT EXISTS avg_intensity NUMERIC(3,2);
+
+CREATE OR REPLACE FUNCTION update_question_pack_intensity_stats(target_pack_id UUID)
+RETURNS void
+LANGUAGE plpgsql
+SET search_path = 'public'
+AS $$
+BEGIN
+  UPDATE question_packs qp
+  SET min_intensity = stats.min_intensity,
+      max_intensity = stats.max_intensity,
+      avg_intensity = stats.avg_intensity
+  FROM (
+    SELECT pack_id,
+           MIN(intensity) AS min_intensity,
+           MAX(intensity) AS max_intensity,
+           ROUND(AVG(intensity)::numeric, 2) AS avg_intensity
+    FROM questions
+    WHERE pack_id = target_pack_id
+    GROUP BY pack_id
+  ) stats
+  WHERE qp.id = stats.pack_id;
+
+  IF NOT FOUND THEN
+    UPDATE question_packs
+    SET min_intensity = NULL,
+        max_intensity = NULL,
+        avg_intensity = NULL
+    WHERE id = target_pack_id;
+  END IF;
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION handle_question_intensity_change()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+SET search_path = 'public'
+AS $$
+BEGIN
+  IF TG_OP = 'DELETE' THEN
+    PERFORM update_question_pack_intensity_stats(OLD.pack_id);
+    RETURN OLD;
+  END IF;
+
+  IF TG_OP = 'UPDATE' AND NEW.pack_id IS DISTINCT FROM OLD.pack_id THEN
+    PERFORM update_question_pack_intensity_stats(OLD.pack_id);
+  END IF;
+
+  PERFORM update_question_pack_intensity_stats(NEW.pack_id);
+  RETURN NEW;
+END;
+$$;
+
+DROP TRIGGER IF EXISTS question_pack_intensity_stats ON questions;
+
+CREATE TRIGGER question_pack_intensity_stats
+AFTER INSERT OR UPDATE OR DELETE ON questions
+FOR EACH ROW EXECUTE FUNCTION handle_question_intensity_change();
+
+UPDATE question_packs qp
+SET min_intensity = stats.min_intensity,
+    max_intensity = stats.max_intensity,
+    avg_intensity = stats.avg_intensity
+FROM (
+  SELECT pack_id,
+         MIN(intensity) AS min_intensity,
+         MAX(intensity) AS max_intensity,
+         ROUND(AVG(intensity)::numeric, 2) AS avg_intensity
+  FROM questions
+  GROUP BY pack_id
+) stats
+WHERE qp.id = stats.pack_id;