-- v0.803 ADM1-04: Global announcements
CREATE TABLE IF NOT EXISTS announcements (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    title VARCHAR(200) NOT NULL,
    content TEXT NOT NULL,
    type VARCHAR(20) NOT NULL DEFAULT 'info',
    is_active BOOLEAN NOT NULL DEFAULT true,
    starts_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    ends_at TIMESTAMPTZ,
    created_by UUID REFERENCES users(id),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_announcements_is_active ON announcements(is_active) WHERE is_active = true;
CREATE INDEX IF NOT EXISTS idx_announcements_starts_ends ON announcements(starts_at, ends_at);