Add category deletion feature

services/database.ts

@@ -1633,6 +1633,97 @@ export async function updateEpisodeCategory(
   }
 }
 
+// Category cleanup functions
+export async function deleteFeedCategory(category: string): Promise<number> {
+  try {
+    const stmt = db.prepare("UPDATE feeds SET category = NULL WHERE category = ?");
+    const result = stmt.run(category);
+    return result.changes;
+  } catch (error) {
+    console.error("Error deleting feed category:", error);
+    throw error;
+  }
+}
+
+export async function deleteEpisodeCategory(category: string): Promise<number> {
+  try {
+    const stmt = db.prepare("UPDATE episodes SET category = NULL WHERE category = ?");
+    const result = stmt.run(category);
+    return result.changes;
+  } catch (error) {
+    console.error("Error deleting episode category:", error);
+    throw error;
+  }
+}
+
+export async function deleteCategoryFromBoth(category: string): Promise<{feedChanges: number, episodeChanges: number}> {
+  try {
+    db.exec("BEGIN TRANSACTION");
+    
+    const feedChanges = await deleteFeedCategory(category);
+    const episodeChanges = await deleteEpisodeCategory(category);
+    
+    db.exec("COMMIT");
+    
+    return { feedChanges, episodeChanges };
+  } catch (error) {
+    db.exec("ROLLBACK");
+    console.error("Error deleting category from both tables:", error);
+    throw error;
+  }
+}
+
+export async function getAllUsedCategories(): Promise<{feedCategories: string[], episodeCategories: string[], allCategories: string[]}> {
+  try {
+    // Get feed categories
+    const feedCatStmt = db.prepare(
+      "SELECT DISTINCT category FROM feeds WHERE category IS NOT NULL AND category != '' ORDER BY category"
+    );
+    const feedCatRows = feedCatStmt.all() as any[];
+    const feedCategories = feedCatRows.map(row => row.category);
+
+    // Get episode categories
+    const episodeCatStmt = db.prepare(
+      "SELECT DISTINCT category FROM episodes WHERE category IS NOT NULL AND category != '' ORDER BY category"
+    );
+    const episodeCatRows = episodeCatStmt.all() as any[];
+    const episodeCategories = episodeCatRows.map(row => row.category);
+
+    // Get all unique categories
+    const allCategoriesSet = new Set([...feedCategories, ...episodeCategories]);
+    const allCategories = Array.from(allCategoriesSet).sort();
+
+    return {
+      feedCategories,
+      episodeCategories,
+      allCategories
+    };
+  } catch (error) {
+    console.error("Error getting all used categories:", error);
+    throw error;
+  }
+}
+
+export async function getCategoryCounts(category: string): Promise<{feedCount: number, episodeCount: number}> {
+  try {
+    // Count feeds with this category
+    const feedCountStmt = db.prepare("SELECT COUNT(*) as count FROM feeds WHERE category = ?");
+    const feedCountResult = feedCountStmt.get(category) as { count: number };
+    
+    // Count episodes with this category
+    const episodeCountStmt = db.prepare("SELECT COUNT(*) as count FROM episodes WHERE category = ?");
+    const episodeCountResult = episodeCountStmt.get(category) as { count: number };
+    
+    return {
+      feedCount: feedCountResult.count,
+      episodeCount: episodeCountResult.count
+    };
+  } catch (error) {
+    console.error("Error getting category counts:", error);
+    throw error;
+  }
+}
+
 // Migration function to classify existing episodes without categories
 export async function migrateEpisodesWithCategories(): Promise<void> {
   try {

services/llm.ts

@@ -127,7 +127,10 @@ ${articleDetails}
   try {
     const response = await openai.chat.completions.create({
       model: config.openai.modelName,
-      messages: [{ role: "system", content: prompt.trim() }, {role:"user", content: sendContent.trim()}],
+      messages: [
+        { role: "system", content: prompt.trim() },
+        { role: "user", content: sendContent.trim() },
+      ],
       temperature: 0.6,
     });
 
@@ -171,7 +174,9 @@ export async function openAI_ClassifyEpisode(
   }
 
   const prompt = `
-ポッドキャストエピソードの情報を見て、適切なトピックカテゴリに分類してください。
+以下のポッドキャストエピソードの情報を見て、適切なトピックカテゴリに分類してください。
+
+${textForClassification}
 
 以下のカテゴリから1つを選択してください:
 - テクノロジー
@@ -191,8 +196,8 @@ export async function openAI_ClassifyEpisode(
   try {
     const response = await openai.chat.completions.create({
       model: config.openai.modelName,
-      messages: [{ role: "system", content: prompt.trim() }, {role: "user", content: textForClassification.trim()}],
-      temperature: 0.3,
+      messages: [{ role: "user", content: prompt.trim() }],
+      temperature: 0.2,
     });
 
     const category = response.choices[0]?.message?.content?.trim();