feature: improve admin directory and crawl progress

app/services/crawl_control.py

@@ -0,0 +1,17 @@
+from sqlalchemy import desc, select
+from sqlalchemy.orm import Session
+
+from app.config import Settings
+from app.models import CrawlRun
+from app.services.crawler import run_crawl
+
+
+def get_running_run(db: Session) -> CrawlRun | None:
+    return db.scalar(select(CrawlRun).where(CrawlRun.status == "running").order_by(desc(CrawlRun.started_at)).limit(1))
+
+
+def run_crawl_if_idle(db: Session, settings: Settings) -> tuple[CrawlRun, bool]:
+    running = get_running_run(db)
+    if running:
+        return running, False
+    return run_crawl(db, settings), True