apscheduler

Development

Configures background job scheduling and task execution with APScheduler 3.x in FastAPI. Use when: adding new background jobs, modifying job intervals, implementing job state persistence, handling job events, or debugging scheduler issues.

QUICK START

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APScheduler Skill

Bookkeep uses APScheduler 3.x with AsyncIOScheduler for background job execution. Jobs are registered at startup via initialize_jobs(), persisted to JobSchedule table, and exposed through /api/jobs/ endpoints for runtime control.

Quick Start

Define a New Job

# backend/app/scheduler.py - Add to JOB_DEFINITIONS
JOB_DEFINITIONS = {
    "my_new_job": {
        "default_interval": 60 * 60,  # 1 hour
        "description": "Description for UI/logs",
        "type": "PROCESS",
    },
    # ... existing jobs
}

Implement the Job Function

# backend/app/tasks.py
async def my_new_job():
    """Background task description"""
    db: Session = SessionLocal()
    try:
        # Do work
        logger.info("my_new_job_complete", processed=count)
    except Exception as e:
        logger.error("my_new_job_error", error=str(e))
        db.rollback()
    finally:
        db.close()

Register in initialize_jobs()

# backend/app/scheduler.py - Add to job_functions dict
from app.tasks import my_new_job

job_functions = {
    "my_new_job": my_new_job,
    # ... existing mappings
}

Key Concepts

Concept	Usage	Example
`AsyncIOScheduler`	Main scheduler for async jobs	`scheduler = AsyncIOScheduler()`
`IntervalTrigger`	Time-based job execution	`IntervalTrigger(seconds=300)`
`MemoryJobStore`	In-memory job storage	`jobstores={'default': MemoryJobStore()}`
`JobSchedule` model	Persist intervals/state to DB	See the sqlalchemy skill
`coalesce=True`	Combine missed executions	Prevents job pileup after downtime
`max_instances=1`	Single concurrent execution	Prevents overlapping job runs

Common Patterns

Trigger Job Immediately

from app.scheduler import run_job_now
run_job_now("sync_from_booklore")  # Modifies next_run_time to now

Reschedule with New Interval

from app.scheduler import reschedule_job
reschedule_job("refresh_seed_data", 12 * 60 * 60)  # 12 hours

Related Skills

See the python skill for async patterns and error handling
See the sqlalchemy skill for JobSchedule model and database sessions
See the fastapi skill for router endpoints in routers/jobs.py