diff --git a/server/src/routes/configs.ts b/server/src/routes/configs.ts
index f3838a59..3ffeca48 100644
--- a/server/src/routes/configs.ts
+++ b/server/src/routes/configs.ts
@@ -456,7 +456,15 @@ router.put('/api/settings', (req, res) => {
           value = encrypt(value, config.encryptionKey);
         }
 
-        stmt.run(key, value ?? null);
+        // better-sqlite3 interprets objects/arrays as named parameter maps,
+        // causing RangeError. Serialize non-primitive values to JSON strings.
+        const serialized =
+          value === null || value === undefined
+            ? null
+            : typeof value === 'object'
+              ? JSON.stringify(value)
+              : value;
+        stmt.run(key, serialized);
       }
     });
 
diff --git a/server/src/routes/releases.ts b/server/src/routes/releases.ts
index 840c1bd4..1aedd091 100644
--- a/server/src/routes/releases.ts
+++ b/server/src/routes/releases.ts
@@ -100,7 +100,7 @@ router.put('/api/releases', (req, res) => {
         prerelease, draft, is_read, assets,
         repo_id, repo_full_name, repo_name,
         zipball_url, tarball_url
-      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
     `);
 
     const upsert = db.transaction(() => {
diff --git a/src/services/aiService.ts b/src/services/aiService.ts
index 876fcf22..253f9a14 100644
--- a/src/services/aiService.ts
+++ b/src/services/aiService.ts
@@ -250,9 +250,12 @@ ${options.user}` : options.user;
 
     const candidates = (data as { candidates?: unknown }).candidates;
     if (Array.isArray(candidates) && candidates.length > 0) {
-      const parts = (candidates[0] as { content?: { parts?: unknown } }).content?.parts;
+      const candidate = candidates[0] as { content?: { parts?: unknown }; finishReason?: string };
+      const parts = candidate.content?.parts;
       if (Array.isArray(parts)) {
+        // Skip thought parts emitted by Gemini thinking models (e.g. gemini-2.5-pro)
         const text = parts
+          .filter((p) => p && typeof p === 'object' && !(p as { thought?: boolean }).thought)
           .map((p) => {
             if (!p || typeof p !== 'object') return '';
             const part = p as { text?: unknown };
@@ -476,7 +479,7 @@ Focus on practicality and accurate categorization to help users quickly understa
 
   async testConnection(): Promise<ConnectionTestResult> {
     const apiType = this.getApiType();
-    const timeoutMs = apiType === 'openai-responses' || this.config.reasoningEffort ? 30000 : 10000;
+    const timeoutMs = apiType === 'openai-responses' || apiType === 'gemini' || this.config.reasoningEffort ? 30000 : 10000;
 
     try {
       const base = new URL(this.config.baseUrl);
@@ -497,7 +500,7 @@ Focus on practicality and accurate categorization to help users quickly understa
           system: 'You are a connection test assistant.',
           user: 'Reply with exactly one word: OK',
           temperature: 0,
-          maxTokens: 50,
+          maxTokens: 2048,
           signal: controller.signal,
         });
         if (content) {