chore: add proper-lockfile for safe database read/write operations and implement retry logic for file access

open-sse/config/providers.js

@@ -33,6 +33,7 @@ export const PROVIDERS = {
   claude: {
     baseUrl: "https://api.anthropic.com/v1/messages",
     format: "claude",
+    retry: { 429: 0 },
     headers: {
       "Anthropic-Version": "2023-06-01",
       "Anthropic-Beta": "claude-code-20250219,oauth-2025-04-20,interleaved-thinking-2025-05-14,fine-grained-tool-streaming-2025-05-14,context-management-2025-06-27,prompt-caching-scope-2026-01-05",

open-sse/config/runtimeConfig.js

@@ -60,12 +60,19 @@ export const MEMORY_CONFIG = {
 export const DEFAULT_MAX_TOKENS = 64000;
 export const DEFAULT_MIN_TOKENS = 32000;
 
-// Retry config for 429 responses
+// Retry config for 429 responses (legacy - kept for backward compatibility)
 export const RETRY_CONFIG = {
   maxAttempts: 2,
   delayMs: 2000
 };
 
+// Default retry config by status code (number of retry attempts)
+export const DEFAULT_RETRY_CONFIG = {
+  429: 2,   // Rate limit - retry 2 times
+  503: 0,   // Service unavailable - no retry
+  502: 0    // Bad gateway - no retry
+};
+
 // Exponential backoff config for rate limits
 export const BACKOFF_CONFIG = {
   base: 1000,