CREATE TYPE thread_type AS ENUM (
    'expenses',
    'movies',
    'schedule',
    'recipes',
    'custom'
);

CREATE TABLE threads
(
    id                BIGSERIAL PRIMARY KEY,
    family_id         BIGINT      NOT NULL REFERENCES families (id) ON DELETE CASCADE,
    type              thread_type NOT NULL,
    title             TEXT        NOT NULL,
    telegram_topic_id BIGINT      NOT NULL,
    is_system         BOOLEAN     NOT NULL DEFAULT FALSE,
    created_by        BIGINT      NOT NULL REFERENCES users (id),
    created_at        TIMESTAMP   NOT NULL DEFAULT NOW(),

    UNIQUE (family_id, telegram_topic_id)
);

CREATE UNIQUE INDEX idx_unique_system_threads ON threads (family_id, type) WHERE is_system = TRUE;

CREATE INDEX idx_threads_family_id ON threads (family_id);

CREATE INDEX idx_threads_family_type ON threads(family_id, type);