Add cache clearing function and invoke on startup

api.js

@@ -44,6 +44,20 @@ function cacheImage(config, imageBuffer) {
     fs.writeFileSync(cachePath, imageBuffer);
 }
 
+function clearCache() {
+    if (!fs.existsSync(CACHE_DIR)) {
+        return;
+    }
+
+    const files = fs.readdirSync(CACHE_DIR);
+    files.forEach(file => {
+        const filePath = path.join(CACHE_DIR, file);
+        fs.unlinkSync(filePath);
+    });
+
+    console.log(`Cleared ${files.length} cached image(s)`);
+}
+
 function cleanupOldCache() {
     const ONE_DAY = 24 * 60 * 60 * 1000; // 24 hours in milliseconds
     const now = Date.now();
@@ -190,17 +204,17 @@ app.get('/health', (req, res) => {
     res.status(200).json({ status: 'ok' });
 });
 
+// Clear all cache on startup
+clearCache();
+
 // Run cleanup every hour
 setInterval(() => {
     cleanupOldCache();
 }, 60 * 60 * 1000);
 
-// Run cleanup on startup
-cleanupOldCache();
-
 app.listen(PORT, () => {
     console.log(`Quote generator API running on http://localhost:${PORT}`);
     console.log(`GET:  http://localhost:${PORT}/generate?text=Hello&displayName=Test&username=@test&timestamp=1735574400`);
     console.log(`POST: http://localhost:${PORT}/generate`);
-    console.log(`Cache cleanup runs every hour, images older than 24h are removed`);
+    console.log(`Cache cleared on startup, cleanup runs every hour`);
 });