Update fulcrum to v2.1.0 (#4089)

fulcrum/docker-compose.yml

@@ -27,7 +27,7 @@ services:
         ipv4_address: $APP_FULCRUM_IP
 
   fulcrum:
-    image: cculianu/fulcrum:v2.0.0@sha256:cb1c006d0cff104696f4791d0f1516699b2c163120165461385e4de206271943
+    image: cculianu/fulcrum:v2.1.0@sha256:71cb19ce9f8318edae1b581a793588c98f55f2f28c12e17327c478ed963ef4e3
     init: true
     # Rely on Docker's default SIGTERM; Fulcrum treats SIGTERM/SIGINT/SIGQUIT as graceful
     # Generous grace period prevents SIGKILL during checkpoint/flush on exit

fulcrum/umbrel-app.yml

@@ -4,7 +4,7 @@ implements:
   - electrs
 category: bitcoin
 name: Fulcrum
-version: "2.0.0"
+version: "2.1.0"
 tagline: A fast and nimble Electrum Server
 description: >-
   Run your personal Electrum server and connect your Electrum-compatible wallet,
@@ -30,13 +30,15 @@ gallery:
 path: ""
 defaultPassword: ""
 releaseNotes: >-
-  🚨 This update will automatically trigger a full re-sync of your Fulcrum index. During the
-  re-sync, wallets connected to Fulcrum won't be able to connect.
+  Fulcrum 2.1.0 is a minor upgrade that adds support for the new Electrum Cash protocol v1.6, which includes improvements mainly for Bitcoin. It also contains bugfixes, optimizations, and improvements to peering.
 
 
-  Fulcrum is now far more resilient to restarts, shutdowns, and power loss, avoiding the database corruption issues that notoriously plagued previous versions.
+  Key improvements:
+    - Support for Electrum Cash protocol v1.6
+    - Better peering behavior - Fulcrum no longer maintains active connections to all peers, reducing connection overhead
+    - Fixed an esoteric crash bug when using UPnP with more than 1024 connected clients
 
 
-  Full Fulcrum release notes are available at https://github.com/cculianu/Fulcrum/releases/tag/v2.0.0
+  Full release notes are available at https://github.com/cculianu/Fulcrum/releases/tag/v2.1.0
 backupIgnore:
-  - data/fulcrum/fulc2_db
+  - data/fulcrum/fulc2_db