Initial public release

Full BigBrother network implant - passive SOC + active exploitation. Personal identifiers removed; all capabilities intact. See README.md for setup and docs/deployment.md for detailed deployment.
2026-06-26 09:52:50 -04:00
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+---
+agent: fix-planner
+status: COMPLETE
+timestamp: 2026-04-10T13:45:00Z
+total_findings_raw: 32
+total_findings_deduped: 29
+p1_count: 4
+p2_count: 6
+p3_count: 12
+p4_count: 7
+devtrack_items_created: [551, 552, 553, 554, 555, 556, 557, 558, 559, 560]
+errors: []
+---
+
+# Presence Daemon Fix Plan
+
+## Deduplication Notes
+- **Raw findings:** 32 across 6 audit files (code-auditor, security-auditor, env-validator, db-auditor, test-runner, impl notes)
+- **Deduped:** 29 unique issues (merged findings with same file + issue type; highest severity retained; sources cited)
+- **Sources combined:** DB connection leak (2 sources), struct unpacking edge cases (2 sources), BLE error recovery (2 sources)
+
+---
+
+## P1 — Block Deploy (CRITICAL/HIGH Security or Correctness)
+
+- [x] **[CRITICAL]** `presence_daemon.py:648-656` HTTP status server port hardcoded (9191) — acts as fingerprint | Sources: security-auditor | Effort: XS | DevTrack: #551
+  - **Context:** Port discoverable via `ss -tlnp`, identifies tool via process enumeration
+  - **Fix:** Make configurable via `PRESENCE_STATUS_PORT` env var; document per-deployment variation
+  - **Acceptance:** Port reads from env var; default fallback to 9191 if unset
+  - **Status:** FIXED — STATUS_PORT = int(os.getenv("PRESENCE_STATUS_PORT", "9191")) added at L31; status_server() updated to use STATUS_PORT; install.sh comments updated
+
+- [x] **[CRITICAL]** `presence_daemon.py:156, 172, 193, 208` SQLite connection leak in exception handlers | Sources: db-auditor | Effort: S | DevTrack: #552
+  - **Context:** Functions `lookup_person()`, `seed_persons_from_db()`, `log_signal()`, `log_presence_change()` don't close connections on exceptions; resource exhaustion under high-frequency signal logging
+  - **Fix:** Wrap all `sqlite3.connect()` in try/finally or use context manager (`with` statement)
+  - **Acceptance:** All four functions use context manager; no unclosed connection paths
+  - **Status:** FIXED — All four functions wrapped with try/finally and conn.close() in finally block; timeout increased to 10s
+
+- [x] **[HIGH]** `presence_daemon.py:272-323` Race condition in `update_person_state()` — two-lock acquisition | Sources: code-auditor | Effort: S | DevTrack: #553
+  - **Context:** Lock released between `devices_lock` and `persons_lock`; `max_last_seen` snapshot becomes stale. Concurrent signal could change person state after certainty computed but before lock acquired, causing duplicate alerts or missed transitions.
+  - **Fix:** Acquire both locks atomically or compute entire state transition inside single critical section; snapshot under lock before computing state machine
+  - **Acceptance:** State machine transitions (UNKNOWN→PRESENT, PRESENT→ABSENT) protected by single lock; no log entries showing duplicate/missed transitions
+  - **Status:** FIXED — Certainty computed under devices_lock and snapshot held; state machine logic moved inside persons_lock; alert sending moved outside locks to minimize critical section
+
+- [ ] **[HIGH]** `presence_daemon.py:384-404` Raw socket struct unpacking lacks full validation | Sources: security-auditor | Effort: S | DevTrack: #554
+  - **Context:** Netlink parsing checks `nlmsg_len < 16` but not actual buffer length; DHCP MAC extraction at `[28:34]` not validated. Crafted packets could cause silent truncation, incorrect MAC parsing, or exception flood.
+  - **Fix:** Add explicit length checks before struct.unpack_from() and MAC extraction:
+    ```python
+    # Netlink: before struct.unpack_from('=IHHII', data, offset)
+    if len(data) < offset + 16:
+        logger.warning("Truncated netlink message")
+        return
+    
+    # DHCP: before mac_bytes = dhcp[28:34]
+    if len(dhcp) < 34:
+        return
+    ```
+  - **Acceptance:** All edge cases validated; unit tests (if added) should cover truncated packets
+  - **Status:** NOT FIXED (out of scope for this bugfixer task — only 4 P1 items assigned)
+
+---
+
+## P2 — Fix This Week (HIGH Code Quality or Significant Risk)
+
+- [ ] **[HIGH]** `presence_daemon.py:289` Magic number in aggregate certainty calculation | Sources: code-auditor | Effort: XS | DevTrack: #555
+  - **Context:** Hardcoded `0.08` coefficient for secondary device weighting (line 289: `certainties[0] + 0.08 * certainties[1]`) should be named constant for clarity and maintainability
+  - **Fix:** Extract to module-level constant:
+    ```python
+    SECONDARY_DEVICE_WEIGHT = 0.08
+    # Then in update_person_state():
+    aggregate_certainty = certainties[0] + SECONDARY_DEVICE_WEIGHT * certainties[1]
+    ```
+  - **Acceptance:** Constant named, value unchanged, formula still produces same results
+
+- [ ] **[HIGH]** `presence_daemon.py:20` Unused import urllib.parse | Sources: code-auditor | Effort: XS | DevTrack: #556
+  - **Context:** Imported but never used; only `urllib.request.Request()` and `urllib.request.urlopen()` are called
+  - **Fix:** Remove line 20: `import urllib.parse`
+  - **Acceptance:** No import errors; linter reports no unused imports
+
+- [ ] **[HIGH]** `install.sh:31` Database path mismatch (install.sh vs daemon defaults) | Sources: code-auditor | Effort: XS | DevTrack: #557
+  - **Context:** install.sh forces `/opt/sensor/sensor.db` (line 31) but daemon defaults to `/opt/presence/presence.db` (presence_daemon.py:29). Will create two separate databases.
+  - **Fix:** Align paths. Recommend standardizing on `/opt/presence/presence.db` (more descriptive name):
+    - Update install.sh line 31: `PRESENCE_DB_PATH=/opt/presence/presence.db`
+    - Verify daemon defaults match or accept via env var override
+  - **Acceptance:** Single database file created; systemd EnvironmentFile sets consistent path; no duplicate databases on disk
+
+- [ ] **[HIGH]** `presence_daemon.py:541-573` BLE scanner missing error recovery — event loop can die silently | Sources: security-auditor, db-auditor | Effort: M | DevTrack: #558
+  - **Context:** No retry loop or watchdog; malformed BLE packets could crash event loop, silently disabling BLE tracking. Also overlaps with seed_persons_from_db() error handling (db-auditor: missing recovery on empty persons table).
+  - **Fix:** 
+    1. Add retry loop with exponential backoff to `ble_scanner()` thread:
+       ```python
+       retries = 0
+       while retries < 5:
+           try:
+               loop.run_until_complete(run_ble_scan())
+               retries = 0  # Reset on success
+           except Exception as e:
+               logger.error(f"BLE scan iteration failed: {e}")
+               retries += 1
+               time.sleep(2 ** retries)  # Exponential backoff: 2, 4, 8, 16, 32 sec
+       logger.critical("BLE scanner exhausted retries; disabling")
+       ```
+    2. Implement watchdog thread to detect BLE thread death and restart
+    3. Validate persons table on startup in `seed_persons_from_db()`: fail loud if empty and no override
+  - **Acceptance:** BLE scanner recovers from transient errors; critical log on exhaustion; daemon validates person list at startup
+
+- [x] **[HIGH]** `presence_daemon.py:142-147` init_db() missing WAL mode and pragmas | Sources: db-auditor | Effort: XS | DevTrack: #559
+  - **Context:** No PRAGMA journal_mode=WAL; synchronous journaling under 6-thread concurrent write load will serialize and timeout (SQLITE_BUSY errors)
+  - **Fix:** Add to `init_db()` or presence_schema.sql:
+    ```python
+    # In init_db(), after conn.execute(schema):
+    conn.execute('PRAGMA journal_mode=WAL')
+    conn.execute('PRAGMA synchronous=NORMAL')
+    conn.execute('PRAGMA foreign_keys=ON')
+    conn.commit()
+    ```
+  - **Acceptance:** `PRAGMA journal_mode` reports WAL; no SQLITE_BUSY timeouts under sustained signal load; schema integrity enforced
+  - **Status:** FIXED — WAL pragmas added to init_db() at L148-150, committed at L151
+
+- [ ] **[HIGH]** `presence_daemon.py:605` N+1 pattern in decay_loop — inefficient person state recomputation | Sources: db-auditor | Effort: M | DevTrack: #560
+  - **Context:** Every person state update re-computes aggregate certainty from full devices dict; should batch-compute all person states once per decay interval
+  - **Fix:** Refactor decay_loop to compute all person states in one pass:
+    ```python
+    def decay_loop():
+        while True:
+            time.sleep(60)
+            try:
+                with devices_lock:
+                    # Collect all person_ids
+                    person_ids = set(d.person_id for d in devices.values() if d.person_id)
+                    # Compute all person states in one critical section
+                    decayed_devices = {mac: decay_device(dev) for mac, dev in devices.items()}
+                
+                # State transitions outside lock
+                for person_id in person_ids:
+                    update_person_state(person_id)
+    ```
+  - **Acceptance:** Decay loop computes person states once per 60-second interval; no duplicate iterations per person
+
+---
+
+## P3 — Fix This Month (MEDIUM Code Quality or Noticeable Risk)
+
+- [ ] **[MEDIUM]** `presence_daemon.py:468-538` High cyclomatic complexity in parse_dhcp() | Sources: code-auditor | Effort: S
+  - Description: 71 lines, 20 branches, 5 nesting levels; mixes header parsing + DHCP option parsing
+  - Fix: Extract packet validation to separate function; move DHCP option parsing to dedicated helper
+  - Remediation: `parse_dhcp_options(dhcp_payload) -> dict` returning option_type → value mapping
+
+- [ ] **[MEDIUM]** `presence_daemon.py:326-361` Deep nesting in probe_sniffer() — 6 levels | Sources: code-auditor | Effort: S
+  - Description: Multiple if statements nested 6 levels; hard to follow control flow
+  - Fix: Extract frame validation logic into `validate_probe_request(data) -> Optional[str]` returning MAC or None
+
+- [ ] **[MEDIUM]** `presence_daemon.py:576-609` Inconsistent error handling in decay_loop() | Sources: code-auditor | Effort: S
+  - Description: Catches all exceptions but silently continues; no distinction between transient and fatal errors
+  - Fix: Separate transient network errors (debug level) from state machine errors (error/warning level)
+
+- [ ] **[MEDIUM]** `presence_daemon.py:282-284` Early return in update_person_state() leaves persons_lock unprotected | Sources: code-auditor | Effort: XS
+  - Description: If no devices found, returns inside devices_lock but person state not re-checked
+  - Fix: Re-check person state after lock release or defer return until both locks acquired
+
+- [ ] **[MEDIUM]** `presence_daemon.py:437-439` Weak infrastructure IP filtering — empty set never populated | Sources: code-auditor | Effort: S
+  - Description: infrastructure_ips checked but never initialized; filter never applies
+  - Fix: Either populate from config at startup or remove dead code
+
+- [ ] **[MEDIUM]** `presence_daemon.py:661-686` Daemon thread join() semantics — daemon=True threads not blocking | Sources: code-auditor | Effort: S
+  - Description: All threads created with daemon=True then joined; join() is vestigial
+  - Fix: Remove daemon=True flag (prefer explicit cleanup) or remove join() calls
+
+- [ ] **[MEDIUM]** `presence_daemon.py:43-50` Logging fingerprints — tool identity in log messages | Sources: security-auditor | Effort: S
+  - Description: Messages like "Sensor daemon started", "Probe sniffer", "DHCP sniffer" identify daemon as surveillance tool
+  - Fix: Use generic messages ("Network listener probe active", "Listening for ARP events"); move identification to comments only
+
+- [ ] **[MEDIUM]** `presence_daemon.py:296-323` HTTP webhook timeout under lock — blocks person state queries | Sources: security-auditor | Effort: S
+  - Description: persons_lock held during send_alert(); 5-second HTTP timeout blocks all state reads
+  - Fix: Snapshot person data under lock, release before send_alert():
+    ```python
+    with persons_lock:
+        person = persons.get(person_id)
+        if person is None:
+            return
+        old_status = person.status
+        # ... state machine ...
+        person.status = new_status
+    
+    # Outside lock
+    send_alert(person.name, "PRESENT", ...)
+    ```
+
+- [ ] **[MEDIUM]** `install.sh:20-35` Install script missing Matrix webhook configuration | Sources: env-validator | Effort: S
+  - Description: Systemd unit does not include PRESENCE_MATRIX_WEBHOOK; users must manually add
+  - Fix: Add Infisical integration; create start.sh wrapper that fetches webhook from vault at boot
+  - Remediation: `eval $(creds env bigbrother)` pattern in start.sh
+
+- [ ] **[MEDIUM]** `presence_schema.sql:22` Missing index on occupancy_log(ts) | Sources: db-auditor | Effort: XS
+  - Description: High-frequency writes without ts index; time-range queries will full-table scan
+  - Fix: Add `CREATE INDEX idx_occupancy_ts ON occupancy_log(ts);`
+
+- [ ] **[MEDIUM]** `presence_daemon.py:156, 172, 193, 208` Connection timeout too short (1 second) | Sources: db-auditor | Effort: XS
+  - Description: Under multi-threaded contention + synchronous journaling, SQLITE_BUSY errors likely
+  - Fix: Increase timeout to 10-30 seconds in all sqlite3.connect(timeout=...) calls OR enable WAL + NORMAL synchronous (via P2 #559)
+
+- [ ] **[MEDIUM]** `presence_daemon.py` No tests exist for presence daemon | Sources: test-runner | Effort: L
+  - Description: Zero test coverage for 690-line daemon with 15+ functions
+  - Note: Per task instructions, tests not created by test-runner. Flag for human review if required as P1 acceptance criterion.
+
+---
+
+## P4 — Backlog (LOW Code Quality or Style)
+
+- [ ] **[LOW]** `presence_daemon.py:601` Inefficient device pruning during iteration | Effort: XS
+  - Description: Deletes from dict during iteration (safe via deferred list but inelegant)
+  - Fix: Build new dict with comprehension: `devices = {mac: dev for mac, dev in devices.items() if elapsed_minutes < 120}`
+
+- [ ] **[LOW]** `presence_daemon.py:612-614` Inline handler factory pattern creates class per request | Effort: XS
+  - Description: StatusHandler class defined in function, returns new class per request
+  - Fix: Define StatusHandler at module level, pass to HTTPServer
+
+- [ ] **[LOW]** `presence_daemon.py:241-270` Bare on_signal() calls lack source context | Effort: S
+  - Description: Called from 5 sources but doesn't log caller/thread context
+  - Fix: Add logger context or thread names for debugging multi-threaded flow
+
+- [ ] **[LOW]** `presence_schema.sql:1-34` No compound index on frequent queries | Effort: XS
+  - Description: idx_signals_mac and idx_signals_ts separate but queries filter on both
+  - Fix: Add `CREATE INDEX idx_signals_mac_ts ON signals(mac, ts);`
+
+- [ ] **[LOW]** `install.sh:10-11` Unnecessary chown after mkdir | Effort: XS
+  - Description: mkdir with sudo, then chown may fail or be no-op
+  - Fix: Run entire install non-root with sudo only for systemd registration
+
+- [ ] **[LOW]** `presence_schema.sql:1-28` Schema lacks enforced foreign keys | Effort: XS
+  - Description: REFERENCES present but PRAGMA foreign_keys never enabled
+  - Fix: Execute `PRAGMA foreign_keys=ON;` in init_db() before schema execution
+
+- [ ] **[LOW]** `presence_daemon.py:142-147` No connection validation in init_db() | Effort: S
+  - Description: Never verifies schema creation succeeded or tables readable
+  - Fix: Add startup check to validate tables exist and are readable
+
+---
+
+## Summary Table
+
+| Priority | Count | Effort | DevTrack | Status |
+|----------|-------|--------|----------|--------|
+| P1 | 4 | 3×S, 1×XS | #551-554 | BLOCKED until fixed |
+| P2 | 6 | 2×M, 3×S, 1×XS | #555-560 | BLOCKED until fixed |
+| P3 | 12 | 1×L, 8×S, 3×XS | — | Can run tests after P1+P2 |
+| P4 | 7 | 1×S, 6×XS | — | Nice to have |
+
+---
+
+## Effort Breakdown
+- **XS** (<30 min): 8 items (magic number, unused import, path mismatch, connection timeout, occupancy index, compound index, chown, foreign keys)
+- **S** (30 min - 2 hr): 12 items (connection leak, race condition, struct validation, error handling, logging, webhook, deep nesting, nesting, etc.)
+- **M** (2 - 8 hr): 2 items (BLE recovery, N+1 pattern, WAL mode + pragmas)
+- **L** (1 - 3 days): 1 item (test suite)
+
+**Minimal path to unblock deploy (P1+P2):** ~10 hours effort across 10 critical fixes.
+
+---
+
+## Deployment Gate
+
+**Item #530 cannot advance to testing until:**
+1. All P1 items (#551-554) fixed and verified
+2. All P2 items (#555-560) fixed and verified
+3. Code review confirms no regressions in:
+   - Signal processing pipeline
+   - Person state machine transitions
+   - Database persistence and recovery
+   - Thread safety (no new deadlocks)
+
+**Testing verification checklist:**
+- [ ] No SQLITE_BUSY errors under sustained signal load
+- [ ] No connection exhaustion after 1 hour runtime
+- [ ] Person state transitions fire correctly (no duplicates, no missed alerts)
+- [ ] Status endpoint accessible on configurable port
+- [ ] Database path matches install.sh defaults or env override
+- [ ] BLE scanner recovers from transient errors
@@ -0,0 +1,202 @@
+# Presence Daemon — Person Presence Intelligence
+
+Passive multi-signal WiFi/ARP/DHCP/BLE person presence tracking daemon for BigBrother drop implant.
+
+## Quick Start
+
+```bash
+cd /path/to/bigbrother/presence
+sudo bash install.sh
+```
+
+This creates `/opt/sensor/sensor.py`, initializes the database, and starts the systemd service.
+
+## Configuration
+
+Environment variables:
+- `PRESENCE_MONITOR_IFACE` — WiFi monitor mode interface (default: wlan1)
+- `PRESENCE_DATA_IFACE` — Connected network interface for ARP/DHCP (default: wlan0)
+- `PRESENCE_DB_PATH` — SQLite database location (default: /opt/presence/presence.db)
+- `PRESENCE_MATRIX_WEBHOOK` — Matrix webhook URL for alerts (default: empty, no alerts)
+
+Example systemd override:
+```bash
+sudo systemctl edit sensor
+# Add to [Service] section:
+# Environment=PRESENCE_MONITOR_IFACE=wlan2
+# Environment=PRESENCE_MATRIX_WEBHOOK=https://matrix.example.com/hook/...
+```
+
+## Architecture
+
+### Sensor Threads (4 concurrent)
+
+1. **Probe Sniffer** — WiFi probe request capture on monitor interface
+   - Passive 802.11 frame parsing (type 0, subtype 4)
+   - Extracts source MAC → +0.60 certainty bump
+   - Runs on PRESENCE_MONITOR_IFACE
+
+2. **ARP Listener** — netlink RTM_NEWNEIGH/RTM_DELNEIGH events
+   - Kernel neighbor discovery events
+   - Filters infrastructure IPs
+   - Extracts MAC → +0.50 certainty bump
+
+3. **DHCP Sniffer** — AF_PACKET raw socket on data interface
+   - Captures DHCP DISCOVER/REQUEST packets
+   - Extracts client MAC (chaddr field)
+   - Extracts hostname (option 12)
+   - MAC → +0.80 certainty bump
+
+4. **BLE Scanner** — Passive BLE device discovery
+   - Uses `bleak` library if available
+   - Gracefully disables if ImportError
+   - Device address → +0.40 certainty bump
+
+### Core Logic
+
+**Signal Fusion** (per person):
+- Collect all device certainties
+- Apply exponential decay: `certainty × e^(-0.08 × age_minutes)`
+- Aggregate: `max + 0.08 × second_max`
+- Check state machine
+
+**Presence Anchor** (critical):
+- Once PRESENT (certainty ≥ 0.40), hold PRESENT for 45 minutes from last signal
+- Prevents false ABSENT from temporary signal loss (iOS suppression, WiFi roam, power save)
+- After 45 minutes without signal ≥ 0.40 → ABSENT
+
+**State Machine**:
+```
+UNKNOWN  →  PRESENT  →  ABSENT  →  PRESENT
+  ↓        agg_cert           ↓
+  └─────────≥ 0.40    45 min no signal
+```
+
+**Alerting**:
+- UNKNOWN → PRESENT: "ARRIVED" alert
+- PRESENT → ABSENT: "DEPARTED" alert
+- Via Matrix webhook if configured
+
+### Database Schema
+
+**persons** — Named people
+- id (PK)
+- name — Person name
+- notes — Optional metadata
+
+**devices** — MAC-to-person mapping
+- mac (PK)
+- person_id (FK)
+- label — Device name (iPhone, Laptop, etc.)
+- added_at — Timestamp
+
+**signals** — Raw signal observations
+- id (PK)
+- mac — Device MAC
+- signal_type — "probe", "arp", "dhcp", or "ble"
+- certainty — Aggregated certainty after this signal
+- ts — Observation timestamp
+
+**occupancy_log** — State transitions
+- id (PK)
+- person_id (FK)
+- old_status — Previous state
+- new_status — New state
+- ts — Transition timestamp
+
+## HTTP Status Endpoint
+
+GET http://127.0.0.1:9191/
+
+Returns JSON:
+```json
+{
+  "persons": [
+    {
+      "id": 1,
+      "name": "Alice",
+      "status": "PRESENT",
+      "last_change": 1712761234.5
+    }
+  ]
+}
+```
+
+## Limitations (Phase 1)
+
+- **No auto-enrollment**: Device-to-person mapping must be set up manually in database
+- **No mDNS parsing**: Hostnames are not extracted or used for identity
+- **BLE optional**: Requires `bleak` library; gracefully disabled if missing
+- **Monitor mode required**: Probe sniffer needs separate WiFi adapter in monitor mode
+- **Root access needed**: Raw sockets require CAP_NET_ADMIN or root
+- **Single location**: No multi-room support
+
+## Files
+
+- `presence_daemon.py` — Main daemon (1000+ lines)
+- `presence_schema.sql` — SQLite schema
+- `install.sh` — Deployment script
+- `AUDIT_impl.md` — Implementation notes and audit checklist
+- `README.md` — This file
+
+## Logging
+
+Logs to `/var/log/sensor.log` and stdout. Log level: INFO (debug messages only on errors).
+
+Example log output:
+```
+2026-04-10 14:54:32,123 [INFO] Database initialized at /opt/sensor/sensor.db
+2026-04-10 14:54:32,124 [INFO] Loaded 2 persons from database
+2026-04-10 14:54:32,125 [INFO] Probe sniffer started on wlan1
+2026-04-10 14:54:32,126 [INFO] ARP listener started
+2026-04-10 14:54:32,127 [INFO] DHCP sniffer started on wlan0
+2026-04-10 14:54:32,128 [INFO] BLE scanner started
+2026-04-10 14:54:32,129 [INFO] Status server started on http://127.0.0.1:9191
+2026-04-10 14:54:32,130 [INFO] Sensor daemon started
+```
+
+## Testing
+
+1. Verify systemd service is running:
+   ```bash
+   sudo systemctl status sensor
+   ```
+
+2. Check database initialization:
+   ```bash
+   sqlite3 /opt/sensor/sensor.db ".tables"
+   ```
+
+3. Query persons:
+   ```bash
+   sqlite3 /opt/sensor/sensor.db "SELECT * FROM persons;"
+   ```
+
+4. Query recent signals:
+   ```bash
+   sqlite3 /opt/sensor/sensor.db "SELECT * FROM signals ORDER BY ts DESC LIMIT 10;"
+   ```
+
+5. Check status endpoint:
+   ```bash
+   curl http://127.0.0.1:9191/
+   ```
+
+6. Check logs:
+   ```bash
+   tail -f /var/log/sensor.log
+   ```
+
+## Phase 2 Roadmap
+
+- Auto-enrollment from mDNS hostnames
+- BLE MAC signature recognition (Apple Watch, AirPods)
+- Device quorum (multi-device presence confirmation)
+- Tentative device linking via co-occurrence windows
+
+## Phase 3 Roadmap
+
+- Pattern of life analytics
+- Arrival/departure time learning
+- Occupancy forecasting
+- Multi-location aggregation
@@ -0,0 +1,50 @@
+#!/bin/bash
+# Install script for presence daemon
+# Deploys sensor.py and service configuration to /opt/sensor/
+
+set -e
+
+echo "Installing presence daemon..."
+
+# Create sensor directory
+sudo mkdir -p /opt/sensor
+sudo chown $USER:$USER /opt/sensor
+
+# Copy daemon and schema
+cp presence_daemon.py /opt/sensor/sensor.py
+cp presence_schema.sql /opt/sensor/
+chmod +x /opt/sensor/sensor.py
+
+echo "Created /opt/sensor/sensor.py and schema"
+
+# Create systemd service
+sudo tee /etc/systemd/system/sensor.service > /dev/null << 'EOF'
+[Unit]
+Description=Network Sensor
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/python3 /opt/sensor/sensor.py
+Restart=on-failure
+RestartSec=10
+Environment=PRESENCE_DB_PATH=/opt/sensor/presence.db
+# Optional: override default status port (9191)
+# Environment=PRESENCE_STATUS_PORT=9191
+# Optional: configure Matrix webhook for alerts
+# Environment=PRESENCE_MATRIX_WEBHOOK=https://matrix.example.com/hook
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+echo "Created /etc/systemd/system/sensor.service"
+
+# Reload systemd and enable service
+sudo systemctl daemon-reload
+sudo systemctl enable sensor
+sudo systemctl start sensor
+
+echo "Enabled and started sensor service"
+echo "Status:"
+sudo systemctl status sensor --no-pager | head -20
@@ -0,0 +1,719 @@
+#!/usr/bin/env python3
+"""
+Presence daemon — Multi-signal WiFi/ARP/DHCP/BLE person presence tracking.
+Passive sensors with exponential decay and presence anchoring.
+Zero active probing. No tool fingerprints in output.
+"""
+
+import asyncio
+import http.server
+import json
+import logging
+import math
+import os
+import socket
+import sqlite3
+import struct
+import sys
+import threading
+import time
+import urllib.parse
+import urllib.request
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Optional
+
+# --- Config (env-driven) ---
+MONITOR_IFACE = os.getenv("PRESENCE_MONITOR_IFACE", "wlan1")
+DATA_IFACE = os.getenv("PRESENCE_DATA_IFACE", "wlan0")
+DB_PATH = os.getenv("PRESENCE_DB_PATH", "/opt/sensor/presence.db")
+MATRIX_WEBHOOK = os.getenv("PRESENCE_MATRIX_WEBHOOK", "")
+STATUS_PORT = int(os.getenv("PRESENCE_STATUS_PORT", "9191"))
+PRESENCE_THRESHOLD = 0.40
+ABSENCE_THRESHOLD = 0.10
+ANCHOR_MINUTES = 45
+DECAY_LAMBDA = 0.08
+
+# Signal bump constants
+PROBE_BUMP = 0.60
+ARP_BUMP = 0.50
+DHCP_BUMP = 0.80
+BLE_BUMP = 0.40
+
+# Logging
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s [%(levelname)s] %(message)s",
+    handlers=[
+        logging.FileHandler("/var/log/sensor.log", encoding="utf-8"),
+        logging.StreamHandler(sys.stdout)
+    ]
+)
+logger = logging.getLogger(__name__)
+
+# Top OUI prefixes (inline, no external DB)
+OUI_DICT = {
+    "88A29E": "Apple",
+    "001A7D": "Apple",
+    "185F3F": "Apple",
+    "A4C3F0": "Apple",
+    "0899D8": "Apple",
+    "004096": "Apple",
+    "00219B": "Apple",
+    "0021E9": "Apple",
+    "005973": "Apple",
+    "006377": "Apple",
+    "0064B9": "Apple",
+    "0084F3": "Apple",
+    "00A04D": "Apple",
+    "00D04B": "Apple",
+    "28879F": "Google",
+    "2887BA": "Google",
+    "5427EB": "Google",
+    "542758": "Google",
+    "341513": "Amazon",
+    "0C47C2": "Amazon",
+    "B827EB": "Raspberry Pi",
+    "2C56DC": "Raspberry Pi",
+    "E45F01": "Raspberry Pi",
+}
+
+# Netlink constants
+NETLINK_ROUTE = 0
+RTMGRP_NEIGH = 0x4
+RTM_NEWNEIGH = 28
+RTM_DELNEIGH = 29
+NUD_REACHABLE = 0x02
+NUD_STALE = 0x04
+NUD_DELAY = 0x08
+NUD_PROBE = 0x10
+NDA_DST = 1
+NDA_LLADDR = 2
+
+
+@dataclass
+class DeviceState:
+    """In-memory device state."""
+    mac: str
+    certainty: float = 0.0
+    last_seen: float = field(default_factory=time.time)
+    last_signal: str = ""
+    person_id: Optional[int] = None
+
+
+@dataclass
+class PersonState:
+    """In-memory person state."""
+    person_id: int
+    name: str
+    status: str = "UNKNOWN"
+    last_change: float = field(default_factory=time.time)
+
+
+# Shared state with locks
+devices = {}
+devices_lock = threading.Lock()
+
+persons = {}
+persons_lock = threading.Lock()
+
+infrastructure_ips = set()
+infrastructure_lock = threading.Lock()
+
+
+def lookup_oui(mac: str) -> str:
+    """Look up OUI vendor from MAC (first 3 octets, inline dict)."""
+    if not mac or mac == "00:00:00:00:00:00":
+        return "unknown"
+    oui_prefix = mac.replace(":", "").upper()[:6]
+    return OUI_DICT.get(oui_prefix, "unknown")
+
+
+def init_db() -> None:
+    """Initialize SQLite database from schema if not exists."""
+    schema_path = Path(__file__).parent / "presence_schema.sql"
+    if not schema_path.exists():
+        logger.error(f"Schema file not found: {schema_path}")
+        return
+
+    db_path = Path(DB_PATH)
+    db_path.parent.mkdir(parents=True, exist_ok=True)
+
+    conn = sqlite3.connect(DB_PATH, timeout=10)
+    try:
+        cursor = conn.cursor()
+        schema = schema_path.read_text()
+        cursor.executescript(schema)
+        conn.commit()
+        cursor.execute("PRAGMA journal_mode=WAL")
+        cursor.execute("PRAGMA synchronous=NORMAL")
+        cursor.execute("PRAGMA foreign_keys=ON")
+        conn.commit()
+        logger.info(f"Database initialized at {DB_PATH}")
+    except Exception as e:
+        logger.error(f"Failed to init database: {e}")
+    finally:
+        conn.close()
+
+
+def lookup_person(mac: str) -> Optional[int]:
+    """Look up person_id for a MAC from database."""
+    conn = sqlite3.connect(DB_PATH, timeout=10)
+    try:
+        cursor = conn.cursor()
+        result = cursor.execute(
+            "SELECT person_id FROM devices WHERE mac = ?",
+            (mac.lower(),)
+        ).fetchone()
+        return result[0] if result else None
+    except Exception as e:
+        logger.debug(f"lookup_person error for {mac}: {e}")
+        return None
+    finally:
+        conn.close()
+
+
+def seed_persons_from_db() -> None:
+    """Load all persons from database into memory."""
+    conn = sqlite3.connect(DB_PATH, timeout=10)
+    try:
+        conn.row_factory = sqlite3.Row
+        cursor = conn.cursor()
+        rows = cursor.execute("SELECT id, name FROM persons").fetchall()
+
+        with persons_lock:
+            for row in rows:
+                person = PersonState(
+                    person_id=row["id"],
+                    name=row["name"]
+                )
+                persons[row["id"]] = person
+        logger.info(f"Loaded {len(rows)} persons from database")
+    except Exception as e:
+        logger.error(f"Failed to seed persons: {e}")
+    finally:
+        conn.close()
+
+
+def log_signal(mac: str, signal_type: str, certainty: float) -> None:
+    """Insert signal into database (non-blocking via queue would be ideal, but inline for simplicity)."""
+    conn = sqlite3.connect(DB_PATH, timeout=10)
+    try:
+        cursor = conn.cursor()
+        cursor.execute(
+            "INSERT INTO signals (mac, signal_type, certainty, ts) VALUES (?, ?, ?, ?)",
+            (mac.lower(), signal_type, certainty, time.time())
+        )
+        conn.commit()
+    except Exception as e:
+        logger.debug(f"Failed to log signal: {e}")
+    finally:
+        conn.close()
+
+
+def log_presence_change(person_id: int, old_status: str, new_status: str) -> None:
+    """Insert occupancy change into database."""
+    conn = sqlite3.connect(DB_PATH, timeout=10)
+    try:
+        cursor = conn.cursor()
+        cursor.execute(
+            "INSERT INTO occupancy_log (person_id, old_status, new_status, ts) VALUES (?, ?, ?, ?)",
+            (person_id, old_status, new_status, time.time())
+        )
+        conn.commit()
+    except Exception as e:
+        logger.debug(f"Failed to log presence change: {e}")
+    finally:
+        conn.close()
+
+
+def send_alert(person_name: str, status: str, signal_type: str, certainty: float) -> None:
+    """Send alert to Matrix webhook if configured."""
+    if not MATRIX_WEBHOOK:
+        logger.info(f"Alert (no webhook): {person_name} — {status} ({signal_type}, certainty: {certainty:.2f})")
+        return
+
+    try:
+        action = "ARRIVED" if status == "PRESENT" else "DEPARTED"
+        message = f"SENSOR: {person_name} — {action} ({signal_type}, certainty: {certainty:.2f})"
+        payload = json.dumps({"text": message})
+        req = urllib.request.Request(
+            MATRIX_WEBHOOK,
+            data=payload.encode("utf-8"),
+            headers={"Content-Type": "application/json"}
+        )
+        with urllib.request.urlopen(req, timeout=5) as response:
+            logger.info(f"Alert sent: {message}")
+    except Exception as e:
+        logger.error(f"Failed to send alert: {e}")
+
+
+def on_signal(mac: str, signal_type: str, bump: float) -> None:
+    """
+    Process a signal bump for a device.
+    Decay old certainty, apply bump, update state.
+    """
+    mac = mac.lower()
+    with devices_lock:
+        dev = devices.get(mac)
+        if dev is None:
+            dev = DeviceState(
+                mac=mac,
+                certainty=0.0,
+                last_seen=time.time(),
+                last_signal="",
+                person_id=lookup_person(mac)
+            )
+            devices[mac] = dev
+
+        # Apply exponential decay since last signal
+        elapsed_minutes = (time.time() - dev.last_seen) / 60.0
+        dev.certainty = dev.certainty * math.exp(-DECAY_LAMBDA * elapsed_minutes)
+
+        # Apply bump
+        dev.certainty = min(1.0, dev.certainty + bump)
+        dev.last_seen = time.time()
+        dev.last_signal = signal_type
+
+    log_signal(mac, signal_type, dev.certainty)
+    update_person_state(dev.person_id)
+
+
+def update_person_state(person_id: Optional[int]) -> None:
+    """
+    Compute aggregate certainty for a person, update state machine.
+    Fire alerts on state transitions.
+    """
+    if person_id is None:
+        return
+
+    # Snapshot device state under lock
+    with devices_lock:
+        # Get all devices for this person
+        devices_for_person = [d for d in devices.values() if d.person_id == person_id]
+        if not devices_for_person:
+            return
+
+        # Compute aggregate certainty (max + 0.08 * second_max)
+        certainties = sorted([d.certainty for d in devices_for_person], reverse=True)
+        if len(certainties) >= 2:
+            agg_certainty = certainties[0] + 0.08 * certainties[1]
+        else:
+            agg_certainty = certainties[0]
+
+        # Get max last_seen time
+        max_last_seen = max(d.last_seen for d in devices_for_person)
+
+    # Determine new status based on snapshot
+    current_time = time.time()
+    elapsed_since_signal = (current_time - max_last_seen) / 60.0
+
+    with persons_lock:
+        person = persons.get(person_id)
+        if person is None:
+            return
+
+        old_status = person.status
+        new_status = old_status
+
+        # State machine logic
+        if person.status == "UNKNOWN":
+            if agg_certainty >= PRESENCE_THRESHOLD:
+                new_status = "PRESENT"
+        elif person.status == "PRESENT":
+            # Check presence anchor
+            if elapsed_since_signal >= ANCHOR_MINUTES:
+                new_status = "ABSENT"
+        elif person.status == "ABSENT":
+            if agg_certainty >= PRESENCE_THRESHOLD:
+                new_status = "PRESENT"
+
+        # Apply state transition if changed
+        if new_status != old_status:
+            person.status = new_status
+            person.last_change = current_time
+            log_presence_change(person_id, old_status, new_status)
+
+    # Send alert outside of lock
+    if new_status != old_status:
+        if new_status == "PRESENT":
+            send_alert(person.name, "PRESENT", "signal", agg_certainty)
+        else:
+            send_alert(person.name, "ABSENT", "timeout", agg_certainty)
+
+
+def probe_sniffer(iface: str) -> None:
+    """
+    WiFi probe request sniffer.
+    Raw 802.11 frame capture on monitor mode interface.
+    Extracts source MAC from probe requests.
+    """
+    try:
+        s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(0x0003))
+        s.bind((iface, 0))
+        logger.info(f"Probe sniffer started on {iface}")
+
+        while True:
+            try:
+                data, _ = s.recvfrom(65535)
+                if len(data) < 24:
+                    continue
+
+                # 802.11 frame: FC (2) + duration (2) + dest (6) + src (6) + BSSID (6) = 22 bytes min
+                fc = struct.unpack("<H", data[0:2])[0]
+                frame_type = (fc >> 2) & 0x3
+                frame_subtype = (fc >> 4) & 0xf
+
+                # Type 0 = management, Subtype 4 = probe request
+                if frame_type == 0 and frame_subtype == 4:
+                    if len(data) >= 16:
+                        # Source MAC at bytes 10-16
+                        mac_bytes = data[10:16]
+                        mac = ':'.join(f'{b:02x}' for b in mac_bytes)
+                        if mac != "ff:ff:ff:ff:ff:ff" and mac != "00:00:00:00:00:00":
+                            on_signal(mac, "probe", PROBE_BUMP)
+            except Exception as e:
+                logger.debug(f"Probe sniffer error: {e}")
+                time.sleep(0.1)
+    except Exception as e:
+        logger.error(f"Failed to start probe sniffer: {e}")
+
+
+def arp_listener() -> None:
+    """
+    ARP listener via netlink RTM_NEWNEIGH.
+    Kernel pushes neighbor discovery events.
+    """
+    try:
+        s = socket.socket(socket.AF_NETLINK, socket.SOCK_RAW, NETLINK_ROUTE)
+        s.bind((os.getpid(), RTMGRP_NEIGH))
+        logger.info("ARP listener started")
+
+        while True:
+            try:
+                data = s.recv(65535)
+                parse_netlink(data)
+            except Exception as e:
+                logger.debug(f"ARP listener error: {e}")
+                time.sleep(0.1)
+    except Exception as e:
+        logger.error(f"Failed to start ARP listener: {e}")
+
+
+def parse_netlink(data: bytes) -> None:
+    """Parse netlink messages for neighbor events."""
+    try:
+        offset = 0
+        while offset < len(data):
+            if offset + 16 > len(data):
+                break
+
+            nlmsg_len, nlmsg_type, _, _, _ = struct.unpack_from('=IHHII', data, offset)
+            if nlmsg_len < 16:
+                break
+
+            # Verify complete message is available before extracting payload
+            if offset + nlmsg_len > len(data):
+                return
+
+            payload = data[offset + 16:offset + nlmsg_len]
+
+            if nlmsg_type in (RTM_NEWNEIGH, RTM_DELNEIGH):
+                parse_ndmsg(payload, nlmsg_type)
+
+            offset += (nlmsg_len + 3) & ~3
+    except Exception as e:
+        logger.debug(f"Netlink parse error: {e}")
+
+
+def parse_ndmsg(data: bytes, msg_type: int) -> None:
+    """Parse ndmsg (neighbor discovery message)."""
+    try:
+        if len(data) < 12:
+            return
+
+        state = struct.unpack_from('=H', data, 8)[0]
+
+        mac = None
+        ip = None
+        offset = 12
+
+        while offset + 4 <= len(data):
+            rta_len, rta_type = struct.unpack_from('=HH', data, offset)
+            if rta_len < 4:
+                break
+
+            # Verify complete RTA attribute is available before extracting
+            if offset + rta_len > len(data):
+                return
+
+            val = data[offset + 4:offset + rta_len]
+
+            if rta_type == NDA_LLADDR and len(val) == 6:
+                mac = ':'.join(f'{b:02x}' for b in val)
+            elif rta_type == NDA_DST:
+                if len(val) == 4:
+                    ip = socket.inet_ntoa(val)
+
+            offset += (rta_len + 3) & ~3
+
+        if not mac or mac in ('00:00:00:00:00:00', 'ff:ff:ff:ff:ff:ff'):
+            return
+
+        # Ignore infrastructure IPs
+        with infrastructure_lock:
+            if ip and ip in infrastructure_ips:
+                return
+
+        if msg_type == RTM_NEWNEIGH and (state & (NUD_REACHABLE | NUD_STALE | NUD_DELAY | NUD_PROBE)):
+            on_signal(mac, "arp", ARP_BUMP)
+    except Exception as e:
+        logger.debug(f"ndmsg parse error: {e}")
+
+
+def dhcp_sniffer(iface: str) -> None:
+    """
+    DHCP sniffer via AF_PACKET raw socket.
+    Captures DHCP traffic passively, extracts client MACs.
+    """
+    try:
+        s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(0x0003))
+        s.bind((iface, 0))
+        logger.info(f"DHCP sniffer started on {iface}")
+
+        while True:
+            try:
+                data, _ = s.recvfrom(65535)
+                parse_dhcp(data)
+            except Exception as e:
+                logger.debug(f"DHCP sniffer error: {e}")
+                time.sleep(0.1)
+    except Exception as e:
+        logger.error(f"Failed to start DHCP sniffer: {e}")
+
+
+def parse_dhcp(data: bytes) -> None:
+    """Parse DHCP packet and extract client MAC."""
+    try:
+        if len(data) < 14:
+            return
+
+        # Ethernet frame
+        eth_type = struct.unpack('!H', data[12:14])[0]
+        if eth_type != 0x0800:  # not IPv4
+            return
+
+        # IP header
+        if len(data) < 23:
+            return
+        proto = data[23]
+        if proto != 17:  # not UDP
+            return
+
+        # UDP ports
+        if len(data) < 38:
+            return
+        src_port = struct.unpack('!H', data[34:36])[0]
+        dst_port = struct.unpack('!H', data[36:38])[0]
+        if not (src_port in (67, 68) and dst_port in (67, 68)):
+            return
+
+        # DHCP payload (starts at byte 42)
+        if len(data) < 42:
+            return
+        dhcp = data[42:]
+        if len(dhcp) < 236:
+            return
+
+        # MAC address (chaddr at offset 28, 6 bytes)
+        if len(dhcp) < 34:
+            return
+        mac_bytes = dhcp[28:34]
+        mac = ':'.join(f'{b:02x}' for b in mac_bytes)
+        if mac in ('00:00:00:00:00:00', 'ff:ff:ff:ff:ff:ff'):
+            return
+
+        # Parse DHCP options (start at byte 240)
+        if len(dhcp) < 240:
+            return
+
+        msg_type = None
+        i = 240
+        while i < len(dhcp):
+            opt = dhcp[i]
+            if opt == 255:
+                break
+            if opt == 0:
+                i += 1
+                continue
+            if i + 1 >= len(dhcp):
+                break
+
+            length = dhcp[i + 1]
+            if i + 2 + length > len(dhcp):
+                break
+
+            val = dhcp[i + 2:i + 2 + length]
+
+            if opt == 53 and length == 1:  # DHCP message type
+                msg_type = val[0]
+
+            i += 2 + length
+
+        # DISCOVER or REQUEST indicates presence
+        if msg_type in (1, 3):
+            on_signal(mac, "dhcp", DHCP_BUMP)
+    except Exception as e:
+        logger.debug(f"DHCP parse error: {e}")
+
+
+def ble_scanner() -> None:
+    """
+    BLE passive scanner.
+    Gracefully degrades if bleak is not available.
+    """
+    try:
+        from bleak import BleakScanner
+    except ImportError:
+        logger.warning("bleak not available; BLE scanning disabled")
+        return
+
+    async def run_ble_scan() -> None:
+        """Run BLE scan in asyncio loop."""
+        def on_ble_detect(device, adv_data):
+            """Callback for BLE device detection."""
+            if device and device.address:
+                on_signal(device.address.lower(), "ble", BLE_BUMP)
+
+        try:
+            async with BleakScanner(
+                detection_callback=on_ble_detect,
+                scanning_mode="passive"
+            ):
+                await asyncio.sleep(float('inf'))
+        except Exception as e:
+            logger.error(f"BLE scanner error: {e}")
+
+    try:
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
+        loop.run_until_complete(run_ble_scan())
+    except Exception as e:
+        logger.error(f"Failed to start BLE scanner: {e}")
+
+
+def decay_loop() -> None:
+    """
+    Background thread: apply decay to all devices every 60 seconds.
+    Prune devices not seen in 120+ minutes.
+    """
+    while True:
+        try:
+            time.sleep(60)
+
+            with devices_lock:
+                now = time.time()
+                to_prune = []
+
+                for mac, dev in devices.items():
+                    elapsed_minutes = (now - dev.last_seen) / 60.0
+
+                    # Apply decay
+                    dev.certainty = dev.certainty * math.exp(-DECAY_LAMBDA * elapsed_minutes)
+
+                    # Mark for pruning if not seen in 120+ minutes
+                    if elapsed_minutes >= 120:
+                        to_prune.append(mac)
+
+                # Prune old devices
+                for mac in to_prune:
+                    del devices[mac]
+                    logger.debug(f"Pruned device {mac}")
+
+                # Update all person states due to decay
+                for person_id in set(d.person_id for d in devices.values() if d.person_id):
+                    update_person_state(person_id)
+
+        except Exception as e:
+            logger.error(f"Decay loop error: {e}")
+
+
+def status_handler(request, client_address, server):
+    """HTTP request handler for status endpoint."""
+    class StatusHandler(http.server.BaseHTTPRequestHandler):
+        def do_GET(self):
+            if self.path == "/":
+                try:
+                    with persons_lock:
+                        person_list = [
+                            {
+                                "id": p.person_id,
+                                "name": p.name,
+                                "status": p.status,
+                                "last_change": p.last_change
+                            }
+                            for p in persons.values()
+                        ]
+                    response = json.dumps({"persons": person_list})
+                    self.send_response(200)
+                    self.send_header("Content-Type", "application/json")
+                    self.end_headers()
+                    self.wfile.write(response.encode("utf-8"))
+                except Exception as e:
+                    logger.error(f"Status handler error: {e}")
+                    self.send_response(500)
+                    self.end_headers()
+            else:
+                self.send_response(404)
+                self.end_headers()
+
+        def log_message(self, format, *args):
+            """Suppress HTTP server logs."""
+            pass
+
+    return StatusHandler(request, client_address, server)
+
+
+def status_server() -> None:
+    """Start HTTP status server on 127.0.0.1:STATUS_PORT."""
+    try:
+        server = http.server.HTTPServer(
+            ("127.0.0.1", STATUS_PORT),
+            status_handler
+        )
+        logger.info(f"Status server started on http://127.0.0.1:{STATUS_PORT}")
+        server.serve_forever()
+    except Exception as e:
+        logger.error(f"Failed to start status server: {e}")
+
+
+def main() -> None:
+    """Initialize and run all sensor threads."""
+    init_db()
+    seed_persons_from_db()
+
+    threads = [
+        threading.Thread(target=probe_sniffer, args=(MONITOR_IFACE,), daemon=True, name="probe-sniffer"),
+        threading.Thread(target=arp_listener, daemon=True, name="arp-listener"),
+        threading.Thread(target=dhcp_sniffer, args=(DATA_IFACE,), daemon=True, name="dhcp-sniffer"),
+        threading.Thread(target=ble_scanner, daemon=True, name="ble-scanner"),
+        threading.Thread(target=decay_loop, daemon=True, name="decay-loop"),
+        threading.Thread(target=status_server, daemon=True, name="status-server"),
+    ]
+
+    for t in threads:
+        t.start()
+
+    logger.info("Sensor daemon started")
+
+    # Handle shutdown gracefully
+    import signal
+    signal.signal(signal.SIGTERM, lambda *_: sys.exit(0))
+    signal.signal(signal.SIGINT, lambda *_: sys.exit(0))
+
+    for t in threads:
+        t.join()
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,33 @@
+CREATE TABLE IF NOT EXISTS persons (
+    id INTEGER PRIMARY KEY,
+    name TEXT NOT NULL,
+    notes TEXT
+);
+
+CREATE TABLE IF NOT EXISTS devices (
+    mac TEXT PRIMARY KEY,
+    person_id INTEGER REFERENCES persons(id),
+    label TEXT,
+    added_at REAL DEFAULT (unixepoch())
+);
+
+CREATE TABLE IF NOT EXISTS signals (
+    id INTEGER PRIMARY KEY,
+    mac TEXT NOT NULL,
+    signal_type TEXT NOT NULL,
+    certainty REAL NOT NULL,
+    ts REAL DEFAULT (unixepoch())
+);
+
+CREATE TABLE IF NOT EXISTS occupancy_log (
+    id INTEGER PRIMARY KEY,
+    person_id INTEGER REFERENCES persons(id),
+    old_status TEXT,
+    new_status TEXT NOT NULL,
+    ts REAL DEFAULT (unixepoch())
+);
+
+CREATE INDEX IF NOT EXISTS idx_signals_mac ON signals(mac);
+CREATE INDEX IF NOT EXISTS idx_signals_ts ON signals(ts);
+CREATE INDEX IF NOT EXISTS idx_occupancy_person ON occupancy_log(person_id);
+CREATE INDEX IF NOT EXISTS idx_devices_person ON devices(person_id);