-- 0003_reactions.sql
CREATE TABLE IF NOT EXISTS message_reactions (
    message_id BIGINT NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
    user_id    BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    emoji      TEXT NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    PRIMARY KEY (message_id, user_id, emoji)
);
CREATE INDEX IF NOT EXISTS idx_reactions_message ON message_reactions(message_id);