fix: document and wire the DB pool env vars into compose

The new DB_MAX_CONNECTIONS / DB_ACQUIRE_TIMEOUT_SECS knobs were read by the
backend but never added to .env.example or docker-compose.yml, so an operator
setting them in .env would see no effect (caught by the config meta-tests).
Document both in .env.example and wire them into backend.environment.

Bump to 0.124.8.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.env.example

@@ -25,6 +25,12 @@ DATABASE_URL=postgres://mangalord:mangalord@postgres:5432/mangalord
 BIND_ADDRESS=0.0.0.0:8080
 STORAGE_DIR=/var/lib/mangalord/storage
 RUST_LOG=info,mangalord=debug,chromiumoxide::conn=off,chromiumoxide::handler=off
+# Postgres connection-pool sizing. One pool serves HTTP handlers and the
+# crawler/analysis daemons. DB_MAX_CONNECTIONS caps open connections;
+# DB_ACQUIRE_TIMEOUT_SECS is how long a request waits for a free connection
+# before failing fast (rather than hanging on the driver's 30s default).
+DB_MAX_CONNECTIONS=20
+DB_ACQUIRE_TIMEOUT_SECS=10
 
 # ----- Auth / cookies -----
 # COOKIE_SECURE controls whether the `Secure` flag is set on the session

backend/Cargo.lock

@@ -1558,7 +1558,7 @@ checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
 [[package]]
 name = "mangalord"
-version = "0.124.7"
+version = "0.124.8"
 dependencies = [
  "anyhow",
  "argon2",

backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mangalord"
-version = "0.124.7"
+version = "0.124.8"
 edition = "2021"
 default-run = "mangalord"
 

docker-compose.yml

@@ -71,6 +71,9 @@ services:
       BIND_ADDRESS: 0.0.0.0:8080
       STORAGE_DIR: /var/lib/mangalord/storage
       RUST_LOG: ${RUST_LOG:-info,mangalord=debug}
+      # Postgres connection-pool sizing — see .env.example for context.
+      DB_MAX_CONNECTIONS: ${DB_MAX_CONNECTIONS:-20}
+      DB_ACQUIRE_TIMEOUT_SECS: ${DB_ACQUIRE_TIMEOUT_SECS:-10}
       # Auth / cookies — see .env.example for context.
       COOKIE_SECURE: ${COOKIE_SECURE:-true}
       COOKIE_DOMAIN: ${COOKIE_DOMAIN:-}

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mangalord-frontend",
-  "version": "0.124.7",
+  "version": "0.124.8",
   "private": true,
   "type": "module",
   "scripts": {