fix: Make ADS-B history optional and add tests

- Use Docker Compose profiles to make Postgres optional
- Default `docker compose up` runs without history/Postgres
- Use `docker compose --profile history up` to enable history
- Add 11 unit tests for AdsbHistoryWriter and AdsbSnapshotWriter

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -1,12 +1,16 @@
 # INTERCEPT - Signal Intelligence Platform
 # Docker Compose configuration for easy deployment
+#
+# Basic usage:
+#   docker compose up -d
+#
+# With ADS-B history (Postgres):
+#   docker compose --profile history up -d
 
 services:
   intercept:
     build: .
     container_name: intercept
-    depends_on:
-      - adsb_db
     ports:
       - "5050:5050"
     # Privileged mode required for USB SDR device access
@@ -20,6 +24,40 @@ services:
       # - ./data:/app/data
       # Optional: mount logs directory
       # - ./logs:/app/logs
+    environment:
+      - INTERCEPT_HOST=0.0.0.0
+      - INTERCEPT_PORT=5050
+      - INTERCEPT_LOG_LEVEL=INFO
+      # ADS-B history is disabled by default
+      # To enable, use: docker compose --profile history up -d
+      # - INTERCEPT_ADSB_HISTORY_ENABLED=true
+      # - INTERCEPT_ADSB_DB_HOST=adsb_db
+      # - INTERCEPT_ADSB_DB_PORT=5432
+      # - INTERCEPT_ADSB_DB_NAME=intercept_adsb
+      # - INTERCEPT_ADSB_DB_USER=intercept
+      # - INTERCEPT_ADSB_DB_PASSWORD=intercept
+    # Network mode for WiFi scanning (requires host network)
+    # network_mode: host
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-sf", "http://localhost:5050/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+
+  # ADS-B history with Postgres persistence
+  # Enable with: docker compose --profile history up -d
+  intercept-history:
+    build: .
+    container_name: intercept
+    profiles:
+      - history
+    depends_on:
+      - adsb_db
+    ports:
+      - "5050:5050"
+    privileged: true
     environment:
       - INTERCEPT_HOST=0.0.0.0
       - INTERCEPT_PORT=5050
@@ -30,8 +68,6 @@ services:
       - INTERCEPT_ADSB_DB_NAME=intercept_adsb
       - INTERCEPT_ADSB_DB_USER=intercept
       - INTERCEPT_ADSB_DB_PASSWORD=intercept
-    # Network mode for WiFi scanning (requires host network)
-    # network_mode: host
     restart: unless-stopped
     healthcheck:
       test: ["CMD", "curl", "-sf", "http://localhost:5050/health"]
@@ -43,12 +79,13 @@ services:
   adsb_db:
     image: postgres:16-alpine
     container_name: intercept-adsb-db
+    profiles:
+      - history
     environment:
       - POSTGRES_DB=intercept_adsb
       - POSTGRES_USER=intercept
       - POSTGRES_PASSWORD=intercept
     volumes:
-      # Move this path to the USB drive later for larger retention
       - ./pgdata:/var/lib/postgresql/data
     restart: unless-stopped
     healthcheck: