Revive project at new apartment — fixes, SSID update, gitignore

WiFi/firmware:
- SSID updated to botnet in both node and ble_node config.h
- Stale coordinator comment removed from node/config.h

Coordinator fixes:
- BLE-only nodes now visible in dashboard sidebar and node detail
  (build_nodes was querying beacon_events only; BLE nodes have no beacons)
- ble_events and heartbeat_events added to pruning cycle
- ble_events table added to ensure_schema() in dashboard
- confidence column dropped from beacon_events (always 'high', never queried)
- Ingestor commits batched per packet instead of per store call
- wal_autocheckpoint=500 added to ingestor DB connection (writer was missing it)
- python3 -u added to both service ExecStart lines (stdout was buffered,
  logs not appearing in journalctl)

Repo hygiene:
- .gitignore added (events.db, __pycache__, build artifacts)
- events.db removed from git tracking
- README updated: new apartment, node table, active investigations,
  BLE observations labelled as previous-location data, status checklist

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

coordinator/udp_ingest.py

@@ -21,6 +21,7 @@ DB_PATH  = os.path.join(os.path.dirname(__file__), "events.db")
 def init_db(path: str) -> sqlite3.Connection:
     conn = sqlite3.connect(path, check_same_thread=False)
     conn.execute("PRAGMA journal_mode=WAL")
+    conn.execute("PRAGMA wal_autocheckpoint=500")
     conn.execute("""
         CREATE TABLE IF NOT EXISTS beacon_events (
             id          INTEGER PRIMARY KEY AUTOINCREMENT,
@@ -32,8 +33,7 @@ def init_db(path: str) -> sqlite3.Connection:
             rssi        INTEGER,
             channel     INTEGER,
             encryption  TEXT,
-            importance  TEXT,
-            confidence  TEXT
+            importance  TEXT
         )
     """)
     conn.execute("""
@@ -139,8 +139,8 @@ def init_db(path: str) -> sqlite3.Connection:
 def store_beacon(conn: sqlite3.Connection, ev: dict, received_at: str):
     conn.execute("""
         INSERT INTO beacon_events
-            (received_at, node_id, node_ts, ssid, bssid, rssi, channel, encryption, importance, confidence)
-        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+            (received_at, node_id, node_ts, ssid, bssid, rssi, channel, encryption, importance)
+        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
     """, (
         received_at,
         ev.get("node_id"),
@@ -151,7 +151,6 @@ def store_beacon(conn: sqlite3.Connection, ev: dict, received_at: str):
         ev.get("ch"),
         ev.get("enc"),
         ev.get("imp"),
-        ev.get("conf"),
     ))
     conn.commit()
 
@@ -174,7 +173,6 @@ def store_heartbeat(conn: sqlite3.Connection, ev: dict, received_at: str):
         ev.get("assoc_drops"),
         ev.get("ble_drops"),
     ))
-    conn.commit()
 
 
 def store_probe(conn: sqlite3.Connection, ev: dict, received_at: str):
@@ -191,7 +189,6 @@ def store_probe(conn: sqlite3.Connection, ev: dict, received_at: str):
         ev.get("rssi"),
         ev.get("imp"),
     ))
-    conn.commit()
 
 # ─── Validation ──────────────────────────────────────────────────────────────
 
@@ -244,7 +241,6 @@ def store_deauth(conn: sqlite3.Connection, ev: dict, received_at: str):
         ev.get("reason"),
         ev.get("rssi"),
     ))
-    conn.commit()
 
 
 def validate_deauth(ev: dict) -> str | None:
@@ -279,7 +275,6 @@ def store_assoc(conn: sqlite3.Connection, ev: dict, received_at: str):
         ev.get("ssid", ""),
         ev.get("rssi"),
     ))
-    conn.commit()
 
 
 def validate_assoc(ev: dict) -> str | None:
@@ -312,7 +307,6 @@ def store_ble(conn: sqlite3.Connection, ev: dict, received_at: str):
         mfr_id if mfr_id is not None and mfr_id >= 0 else None,
         ev.get("mfr_data", ""),
     ))
-    conn.commit()
 
 
 def validate_ble(ev: dict) -> str | None:
@@ -438,6 +432,8 @@ def handle_packet(data: bytes, addr: tuple, conn: sqlite3.Connection):
         color = IMP_COLOR.get(imp, "")
         print(f"{color}[{received_at}] {node}  {ssid:<32} {bssid}  ch{ch:<3} {rssi:>4}dBm  {enc}{RESET}")
 
+    conn.commit()
+
 # ─── Main ────────────────────────────────────────────────────────────────────
 
 def main():