diff --git a/scripts/db-init.js b/scripts/db-init.js
index 5fa73d3..5c0e16b 100644
--- a/scripts/db-init.js
+++ b/scripts/db-init.js
@@ -6,7 +6,7 @@ const cwd = path.resolve(__dirname, '..'); // get app root when inside /scripts
 
 async function main() {
     console.log("[DB Init] Starting database migration & initialization...");
-    let connectionString = process.env.DATABASE_URL;
+    let connectionString = "";
 
     try {
         const CONFIG_PATH = path.join(cwd, "data", ".db-config.json");
@@ -21,6 +21,12 @@ async function main() {
         console.error("[DB Init] Error reading .db-config.json", e);
     }
 
+    // Force environment variable if present (for Docker/DevOps consistency)
+    if (process.env.DATABASE_URL) {
+        connectionString = process.env.DATABASE_URL;
+        console.log("[DB Init] Using environment variable DATABASE_URL (Priority).");
+    }
+
     if (!connectionString) {
         console.warn("[DB Init] No DATABASE_URL found in env or config. Skipping push.");
         process.exit(0);
diff --git a/src/db/index.ts b/src/db/index.ts
index fc8ce66..0c5266e 100644
--- a/src/db/index.ts
+++ b/src/db/index.ts
@@ -18,10 +18,7 @@ function maskUrl(url: string | undefined) {
 export function getDb() {
     if (currentDb) return currentDb;
 
-    let connectionString = process.env.DATABASE_URL;
-
-    console.log("[DB] Initializing connection...");
-    console.log("[DB] Env DATABASE_URL:", maskUrl(process.env.DATABASE_URL));
+    let connectionString = "";
 
     try {
         const CONFIG_PATH = path.join(process.cwd(), "data", ".db-config.json");
@@ -30,15 +27,21 @@ export function getDb() {
             const config = JSON.parse(fs.readFileSync(CONFIG_PATH, "utf-8"));
             if (config.url) {
                 connectionString = config.url;
-                console.log("[DB] Using saved database URL:", maskUrl(connectionString));
+                console.log("[DB] Loaded saved database URL from config.");
             }
-        } else {
-            console.log("[DB] No saved config file found. Using environment variable.");
         }
     } catch (err) {
         console.error("[DB] Error reading config file:", err);
     }
 
+    // IMPORTANT: Environment variable MUST take precedence in container environments
+    if (process.env.DATABASE_URL) {
+        connectionString = process.env.DATABASE_URL;
+        console.log("[DB] Using environment variable (優先度高).");
+    }
+
+    console.log("[DB] Initializing connection with:", maskUrl(connectionString));
+
     if (!connectionString) {
         console.error("[DB] CRITICAL: No database connection string available!");
     }