some basic statistics and invite tree, plus watch new data

bincio/dev.py

@@ -86,6 +86,62 @@ def _start_serve(data: Path, api_port: int, site: Path) -> None:
     server.run()
 
 
+def _watch_data(data: Path) -> None:
+    """Watch the data directory for sidecar/activity changes and re-merge.
+
+    Monitors every user's edits/ and activities/ subdirectories. When any file
+    changes (new activity extracted, sidecar saved), re-runs merge_all for that
+    user so the _merged/ symlink tree stays current. Astro dev picks up the
+    result automatically because public/data is a symlink into the live data dir.
+
+    Uses watchfiles (bundled with uvicorn[standard]) for efficient OS-level
+    file watching — no polling.
+    """
+    from watchfiles import watch, Change
+
+    watch_paths = []
+    for user_dir in _user_dirs(data):
+        for sub in ("edits", "activities"):
+            p = user_dir / sub
+            p.mkdir(exist_ok=True)
+            watch_paths.append(p)
+
+    if not watch_paths:
+        return
+
+    console.print(f"  [dim]Watching {len(watch_paths)} director{'y' if len(watch_paths) == 1 else 'ies'} for changes…[/dim]")
+
+    # Build a map from path prefix → user dir for targeted merge
+    prefix_to_user: dict[str, Path] = {}
+    for user_dir in _user_dirs(data):
+        for sub in ("edits", "activities"):
+            prefix_to_user[str(user_dir / sub)] = user_dir
+
+    for changes in watch(*watch_paths, yield_on_timeout=False):
+        # Find which users were affected
+        affected: set[Path] = set()
+        for change_type, path in changes:
+            # Skip timeseries / geojson / index churn written by merge itself
+            if any(path.endswith(s) for s in (".timeseries.json", ".geojson", "index.json")):
+                continue
+            for prefix, user_dir in prefix_to_user.items():
+                if path.startswith(prefix):
+                    affected.add(user_dir)
+                    break
+
+        if not affected:
+            continue
+
+        for user_dir in affected:
+            handle = user_dir.name
+            try:
+                from bincio.render.merge import merge_all
+                merge_all(user_dir)
+                console.print(f"  [dim]↺  {handle}: merged[/dim]")
+            except Exception as exc:
+                console.print(f"  [yellow]⚠  {handle}: merge failed — {exc}[/yellow]")
+
+
 @click.command("dev")
 @click.option("--data-dir", default=None, help="BAS data directory (must contain instance.db)")
 @click.option("--site-dir", default=None, help="Astro project directory (default: ./site)")
@@ -144,6 +200,10 @@ def dev(
         t = threading.Thread(target=_start_serve, args=(data, api_port, site), daemon=True)
         t.start()
 
+    # Watch data dir for sidecar/activity changes → auto-merge
+    watcher = threading.Thread(target=_watch_data, args=(data,), daemon=True)
+    watcher.start()
+
     # Build env for astro dev
     env = {
         **os.environ,