Refactor monster_catches from table to view and add overwrite option

- Convert monster_catches from table to view for automatic calculation
- Add overwrite checkbox to monster import UI
- Remove manual INSERT/UPDATE logic for catches (now handled by view)
- Simplify API endpoints to query view instead of managing state
- Add confirmation dialog for overwrite operation

Benefits:
- No data duplication
- Always accurate catch status based on current steps
- Simpler codebase with less state management
- Easier to reset steps without orphaned catch records

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/database.js

@@ -55,18 +55,24 @@ function initializeDatabase() {
       )
     `);
 
-    // Monster catches table
+    // Monster catches view - derived from actual step data
+    // Drop the old table if it exists and recreate as a view
+    db.run(`DROP TABLE IF EXISTS monster_catches`);
     db.run(`
-      CREATE TABLE IF NOT EXISTS monster_catches (
-        id INTEGER PRIMARY KEY AUTOINCREMENT,
-        team_id INTEGER NOT NULL,
-        monster_id INTEGER NOT NULL,
-        caught_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-        final_steps INTEGER NOT NULL,
-        FOREIGN KEY (team_id) REFERENCES teams(id),
-        FOREIGN KEY (monster_id) REFERENCES daily_monsters(id),
-        UNIQUE(team_id, monster_id)
-      )
+      CREATE VIEW IF NOT EXISTS monster_catches AS
+      SELECT
+        dm.id as monster_id,
+        dm.date,
+        t.id as team_id,
+        t.name as team_name,
+        COALESCE(SUM(ds.steps), 0) as final_steps,
+        dm.step_goal
+      FROM daily_monsters dm
+      CROSS JOIN teams t
+      LEFT JOIN participants p ON t.id = p.team_id
+      LEFT JOIN daily_steps ds ON p.id = ds.participant_id AND ds.date = dm.date
+      GROUP BY dm.id, dm.date, t.id, t.name, dm.step_goal
+      HAVING final_steps >= dm.step_goal
     `);
 
     // Create indexes for better query performance
@@ -74,8 +80,6 @@ function initializeDatabase() {
     db.run(`CREATE INDEX IF NOT EXISTS idx_daily_steps_participant ON daily_steps(participant_id)`);
     db.run(`CREATE INDEX IF NOT EXISTS idx_participants_team ON participants(team_id)`);
     db.run(`CREATE INDEX IF NOT EXISTS idx_daily_monsters_date ON daily_monsters(date)`);
-    db.run(`CREATE INDEX IF NOT EXISTS idx_monster_catches_team ON monster_catches(team_id)`);
-    db.run(`CREATE INDEX IF NOT EXISTS idx_monster_catches_monster ON monster_catches(monster_id)`);
 
     console.log('Database initialized successfully');
   });