fix: Remove unused RetentionCohort structs to resolve dead_code warnings

Author: Misei

src-tauri/src/database/data_science_analytics.rs

@@ -181,26 +181,6 @@ pub struct SegmentAvgScore {
     pub user_count: i64,
 }
 
-/// Retention cohort result
-#[derive(Debug, Clone, Serialize, Deserialize)]
-#[serde(rename_all = "camelCase")]
-pub struct RetentionCohortResult {
-    pub cohorts: Vec<RetentionCohort>,
-    pub overall_retention: f64,
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-#[serde(rename_all = "camelCase")]
-pub struct RetentionCohort {
-    pub cohort_week: String,
-    pub cohort_size: i64,
-    pub week_0: f64,
-    pub week_1: f64,
-    pub week_2: f64,
-    pub week_3: f64,
-    pub week_4: f64,
-}
-
 // ============================================================================
 // Phase 4: Anomaly Detection
 // ============================================================================
@@ -565,10 +545,7 @@ pub fn get_emote_analysis(
 
         for emote in emotes {
             *emote_counts.entry(emote.clone()).or_insert(0) += 1;
-            emote_users
-                .entry(emote)
-                .or_default()
-                .push(user.clone());
+            emote_users.entry(emote).or_default().push(user.clone());
         }
     }
 

src-tauri/src/websocket/twitch_irc.rs

@@ -116,7 +116,8 @@ impl TwitchIrcManager {
                 }
 
                 // バッチフラッシュ（100件または5秒ごと）
-                if (batch.len() >= 100 || last_flush.elapsed().as_secs() >= 5) && !batch.is_empty() {
+                if (batch.len() >= 100 || last_flush.elapsed().as_secs() >= 5) && !batch.is_empty()
+                {
                     Self::flush_batch(&db_conn_clone, &mut batch, &logger_clone).await;
                     last_flush = std::time::Instant::now();
                 }