-- Remove UNIQUE(library_id, file_path, generation_type) constraint to allow
-- multiple job rows per file. This enables proper cancel/regenerate semantics:
-- a new job is always inserted on regenerate, and the old job is cancelled
-- independently. The application layer prevents concurrent running jobs.

CREATE TABLE insight_generation_jobs_new (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    library_id INTEGER NOT NULL DEFAULT 1,
    file_path TEXT NOT NULL,
    generation_type TEXT NOT NULL,
    status TEXT NOT NULL DEFAULT 'running',
    started_at INTEGER NOT NULL,
    completed_at INTEGER,
    result_insight_id INTEGER,
    error_message TEXT
);

INSERT INTO insight_generation_jobs_new
    SELECT id, library_id, file_path, generation_type, status, started_at, completed_at, result_insight_id, error_message
    FROM insight_generation_jobs;

DROP TABLE insight_generation_jobs;

ALTER TABLE insight_generation_jobs_new RENAME TO insight_generation_jobs;

CREATE INDEX idx_insight_gen_jobs_file
    ON insight_generation_jobs(library_id, file_path);

CREATE INDEX idx_insight_gen_jobs_status_cleanup
    ON insight_generation_jobs(status, started_at);