-- Settings that must be the same in every outlet of an organization, starting with the
-- loyalty ones (docs/prd-point-coin.md F2, F12): point value, exchange rate, transfer
-- limits and expiry. Same key-value shape as outlet_settings.
CREATE TABLE organization_settings (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    organization_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
    key VARCHAR(255) NOT NULL,
    value TEXT,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    UNIQUE(organization_id, key)
);

-- The unique constraint leads with organization_id, so it also serves the plain
-- per-organization lookups and there is no separate index on that column.

-- Who changed which loyalty setting, from what, to what (F2). Covers both the
-- organization settings above and the per-outlet loyalty keys in outlet_settings.
-- Append-only. Values are stored as text, the same as in the settings tables.
CREATE TABLE loyalty_setting_changes (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    organization_id UUID NOT NULL,
    -- NULL for an organization setting.
    outlet_id UUID,
    key VARCHAR(100) NOT NULL,
    -- NULL when the key had no stored value yet (it was on its default).
    old_value TEXT,
    new_value TEXT,
    changed_by UUID NOT NULL,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE INDEX idx_loyalty_setting_changes_organization_id_created_at ON loyalty_setting_changes(organization_id, created_at DESC);
CREATE INDEX idx_loyalty_setting_changes_outlet_id_created_at ON loyalty_setting_changes(outlet_id, created_at DESC)
    WHERE outlet_id IS NOT NULL;