diff --git a/src/env.ts b/src/env.ts
index 4983a6c..3105868 100644
--- a/src/env.ts
+++ b/src/env.ts
@@ -4,11 +4,13 @@ import { z } from 'zod'
 export const env = createEnv({
   server: {
     DATABASE_URL: z.url({ protocol: /^mysql$/ }),
+    ENABLE_API_DOCS: z.stringbool().default(false),
     LOG_DB: z.stringbool().default(false),
     LOG_FORMAT: z.enum(['pretty', 'json']).optional(),
     LOG_LEVEL: z.enum(['trace', 'debug', 'info', 'warning', 'error', 'fatal']).default('info'),
     SOH_PREDICTION_API_BASE_URL: z.url({ protocol: /^https?$/ }),
     SOH_PREDICTION_CACHE_TTL_SECONDS: z.coerce.number().int().positive().default(86_400),
+    SOH_PREDICTION_NEGATIVE_CACHE_TTL_SECONDS: z.coerce.number().int().positive().default(300),
     SOH_PREDICTION_TIMEOUT_MS: z.coerce.number().int().positive().default(10_000),
   },
   clientPrefix: 'VITE_',
diff --git a/src/routes/api/$.ts b/src/routes/api/$.ts
index a81858b..5f5a3a0 100644
--- a/src/routes/api/$.ts
+++ b/src/routes/api/$.ts
@@ -4,24 +4,27 @@ import { onError } from '@orpc/server'
 import { ZodToJsonSchemaConverter } from '@orpc/zod/zod4'
 import { createFileRoute } from '@tanstack/react-router'
 import { name, version } from '#package'
+import { env } from '@/env'
 import { handleValidationError, logError } from '@/server/api/interceptors'
 import { router } from '@/server/api/routers'
 
 const handler = new OpenAPIHandler(router, {
-  plugins: [
-    new OpenAPIReferencePlugin({
-      docsProvider: 'scalar',
-      schemaConverters: [new ZodToJsonSchemaConverter()],
-      specGenerateOptions: {
-        info: {
-          title: name,
-          version,
-        },
-      },
-      docsPath: '/docs',
-      specPath: '/spec.json',
-    }),
-  ],
+  plugins: env.ENABLE_API_DOCS
+    ? [
+        new OpenAPIReferencePlugin({
+          docsProvider: 'scalar',
+          schemaConverters: [new ZodToJsonSchemaConverter()],
+          specGenerateOptions: {
+            info: {
+              title: name,
+              version,
+            },
+          },
+          docsPath: '/docs',
+          specPath: '/spec.json',
+        }),
+      ]
+    : [],
   interceptors: [onError(logError)],
   clientInterceptors: [onError(handleValidationError)],
 })