CREATE TABLE IF NOT EXISTS directory_scope_rules (
    source_connection_id VARCHAR(36) NOT NULL
        REFERENCES source_connections(id) ON DELETE RESTRICT,
    directory_path TEXT NOT NULL DEFAULT '',
    visibility VARCHAR(20) NOT NULL
        CHECK (visibility IN ('internal', 'external')),
    updated_by VARCHAR(128) NOT NULL,
    reason VARCHAR(500) NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    PRIMARY KEY (source_connection_id, directory_path)
);

CREATE TABLE IF NOT EXISTS source_item_scope_overrides (
    source_item_id VARCHAR(36) NOT NULL
        REFERENCES source_items(id) ON DELETE RESTRICT,
    visibility VARCHAR(20) NOT NULL
        CHECK (visibility IN ('internal', 'external')),
    updated_by VARCHAR(128) NOT NULL,
    reason VARCHAR(500) NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    PRIMARY KEY (source_item_id)
);

CREATE TABLE IF NOT EXISTS scope_change_events (
    id VARCHAR(36) PRIMARY KEY,
    target_type VARCHAR(16) NOT NULL
        CHECK (target_type IN ('directory', 'item')),
    source_connection_id VARCHAR(36)
        REFERENCES source_connections(id) ON DELETE RESTRICT,
    directory_path TEXT NOT NULL DEFAULT '',
    source_item_id VARCHAR(36)
        REFERENCES source_items(id) ON DELETE RESTRICT,
    action VARCHAR(16) NOT NULL
        CHECK (action IN ('set', 'clear')),
    previous_visibility VARCHAR(20)
        CHECK (previous_visibility IS NULL OR previous_visibility IN ('internal', 'external')),
    decided_visibility VARCHAR(20)
        CHECK (decided_visibility IS NULL OR decided_visibility IN ('internal', 'external')),
    operator_ref VARCHAR(128) NOT NULL,
    reason VARCHAR(500) NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CHECK (
        (target_type = 'directory' AND source_connection_id IS NOT NULL AND source_item_id IS NULL)
        OR
        (target_type = 'item' AND source_connection_id IS NULL AND source_item_id IS NOT NULL)
    ),
    CHECK (
        (action = 'set' AND decided_visibility IS NOT NULL)
        OR
        (action = 'clear' AND decided_visibility IS NULL)
    )
);

CREATE INDEX IF NOT EXISTS idx_scope_change_events_target
    ON scope_change_events (target_type, source_connection_id, source_item_id, created_at DESC);