-- Phase 6: Incremental Execution tables
-- artifact_changes: tracks detected changes to artifacts
-- impact_debt: tracks suppressed recomputations

CREATE TABLE IF NOT EXISTS artifact_changes (
    id TEXT PRIMARY KEY,
    artifact_id TEXT NOT NULL,
    old_digest TEXT,
    new_digest TEXT NOT NULL,
    change_type TEXT NOT NULL,
    detected_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
CREATE INDEX IF NOT EXISTS idx_changes_artifact ON artifact_changes(artifact_id);
CREATE INDEX IF NOT EXISTS idx_changes_type ON artifact_changes(change_type);

CREATE TABLE IF NOT EXISTS impact_debt (
    id TEXT PRIMARY KEY,
    artifact_id TEXT NOT NULL,
    dependent_run_id TEXT NOT NULL,
    change_magnitude REAL NOT NULL,
    suppression_reason TEXT NOT NULL,
    recorded_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
CREATE INDEX IF NOT EXISTS idx_debt_artifact ON impact_debt(artifact_id);
CREATE INDEX IF NOT EXISTS idx_debt_run ON impact_debt(dependent_run_id);