diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 132772a..8c132b5 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -1 +1,60 @@
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\ No newline at end of file
+#!/bin/sh
+set -e
+
+# Generate config.yaml from environment variables
+mkdir -p /app/config
+
+cat > /app/config/config.yaml << 'YAMLEOF'
+server:
+  port: 8080
+  webhook_secret: "${GITEA_WEBHOOK_SECRET}"
+
+identity:
+  provider: gitea
+  cache_ttl: 24h
+  gitea:
+    url: "${GITEA_URL}"
+    token: "${GITEA_API_TOKEN}"
+
+notification:
+  provider: slack
+  slack:
+    bot_token: "${SLACK_BOT_TOKEN}"
+
+database:
+  driver: sqlite
+  dsn: "./data/notifications.db"
+
+rules:
+  pr:
+    notify_owner: true
+    notify_reviewers: true
+    notify_assignees: true
+  issue:
+    notify_assignees: true
+  comment:
+    notify_mentioned: true
+    notify_thread_owner: true
+    notify_reviewers: true
+YAMLEOF
+
+# Seed manual user mappings from MANUAL_USER_MAPPINGS env var (JSON: {"gitea_username":"slack_id",...})
+# These bypass the Gitea API email lookup + Slack email lookup
+
+if [ -n "$MANUAL_USER_MAPPINGS" ]; then
+    # Create table and indexes using single-line calls to avoid sh issues with multi-line SQL
+    sqlite3 /app/data/notifications.db "CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY AUTOINCREMENT, gitea_username TEXT UNIQUE, gitea_id INTEGER, email TEXT UNIQUE, full_name TEXT, slack_id TEXT, slack_name TEXT, created_at DATETIME DEFAULT CURRENT_TIMESTAMP, updated_at DATETIME DEFAULT CURRENT_TIMESTAMP);" 2>/dev/null || true
+    sqlite3 /app/data/notifications.db "CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);" 2>/dev/null || true
+    sqlite3 /app/data/notifications.db "CREATE INDEX IF NOT EXISTS idx_users_gitea_username ON users(gitea_username);" 2>/dev/null || true
+    sqlite3 /app/data/notifications.db "CREATE INDEX IF NOT EXISTS idx_users_slack_id ON users(slack_id);" 2>/dev/null || true
+
+    echo "$MANUAL_USER_MAPPINGS" | jq -r 'to_entries[] | "\(.key) \(.value)"' 2>/dev/null | \
+    while read -r gitea_user slack_id; do
+        [ -z "$gitea_user" ] && continue
+        sqlite3 /app/data/notifications.db \
+            "INSERT OR REPLACE INTO users(gitea_username, slack_id, slack_name, updated_at) VALUES('$gitea_user','$slack_id','$gitea_user',datetime('now'));" \
+            2>/dev/null || true
+    done
+fi
+
+exec ./gitea-notification-hub -config /app/config/config.yaml
\ No newline at end of file