-- AI Feedback: thumbs-up/down on Ask Ash replies, plus optional free-form comment.
-- Used by /api/ai/feedback endpoint. Backed by ai_conversations (ON DELETE SET NULL
-- so feedback survives even if the source conversation is purged).

BEGIN;

CREATE TABLE IF NOT EXISTS ai_feedback (
    id              BIGSERIAL PRIMARY KEY,
    user_id         UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    conversation_id UUID REFERENCES ai_conversations(id) ON DELETE SET NULL,
    helpful         BOOLEAN NOT NULL,
    comment         TEXT,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_ai_feedback_user
    ON ai_feedback (user_id, created_at DESC);

-- Hot path: "was this conversation helpful?" analytics
CREATE INDEX IF NOT EXISTS idx_ai_feedback_conversation
    ON ai_feedback (conversation_id);

COMMIT;