Rename shared network to btc-network, remove default network

- All services use btc-network exclusively
- Increase Frankfurter retry to 12x10s for cold start resilience

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

docker-compose.yml

@@ -1,6 +1,6 @@
 networks:
-  shared:
-    name: shared
+  btc-network:
+    name: btc-network
     external: true
 
 services:
@@ -12,8 +12,7 @@ services:
     depends_on:
       - frankfurter
     networks:
-      - default
-      - shared
+      - btc-network
     environment:
       BTCDATA_PORT: "${DOCKER_BTCDATA_PORT}"
       JDBC_URL: "${DOCKER_JDBC_URL}"
@@ -26,3 +25,5 @@ services:
   frankfurter:
     image: lineofflight/frankfurter
     restart: unless-stopped
+    networks:
+      - btc-network

src/clj/pmagnus/btcdata/frankfurter/rates.clj

@@ -36,15 +36,15 @@
   "Fetch immediately, then poll every 60 minutes."
   [client base-url rates-atom running?]
   (future
-    (loop [retries 5]
+    (loop [retries 12]
       (let [ok? (try
                   (poll! client base-url rates-atom)
                   true
                   (catch Exception e
-                    (log/error e (str "Frankfurter fetch failed, retrying in 5s (" retries " left)"))
+                    (log/error e (str "Frankfurter fetch failed, retrying in 10s (" retries " left)"))
                     false))]
         (when (and (not ok?) @running? (pos? retries))
-          (Thread/sleep 5000)
+          (Thread/sleep 10000)
           (recur (dec retries)))))
     (while @running?
       (Thread/sleep 3600000)