diff --git a/server/database.js b/server/database.js
index f2ea8ab..050acf3 100644
--- a/server/database.js
+++ b/server/database.js
@@ -88,6 +88,51 @@ export function initializeDatabase() {
     )
   `);
 
+  // Mining statistics table
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS mining_stats (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      turtle_id INTEGER NOT NULL,
+      block_type TEXT NOT NULL,
+      count INTEGER DEFAULT 1,
+      session_start INTEGER NOT NULL,
+      last_mined INTEGER NOT NULL
+    )
+  `);
+
+  // Turtle groups/teams table
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS turtle_groups (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      group_name TEXT NOT NULL UNIQUE,
+      color TEXT DEFAULT '#3b82f6',
+      created_at INTEGER NOT NULL
+    )
+  `);
+
+  // Turtle group membership table
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS turtle_group_members (
+      turtle_id INTEGER NOT NULL,
+      group_id INTEGER NOT NULL,
+      joined_at INTEGER NOT NULL,
+      PRIMARY KEY (turtle_id, group_id),
+      FOREIGN KEY (group_id) REFERENCES turtle_groups(id) ON DELETE CASCADE
+    )
+  `);
+
+  // Session tracking table (for time-based statistics)
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS turtle_sessions (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      turtle_id INTEGER NOT NULL,
+      started_at INTEGER NOT NULL,
+      ended_at INTEGER,
+      blocks_mined INTEGER DEFAULT 0,
+      distance_traveled INTEGER DEFAULT 0
+    )
+  `);
+
   // Create indexes for better performance
   db.exec(`
     CREATE INDEX IF NOT EXISTS idx_world_blocks_discovered 
@@ -278,6 +323,138 @@ export function closeMiningArea(areaId) {
   stmt.run(Date.now(), areaId);
 }
 
+// Mining Statistics
+export function recordBlockMined(turtleId, blockType) {
+  const stmt = db.prepare(`
+    INSERT INTO mining_stats (turtle_id, block_type, count, session_start, last_mined)
+    VALUES (?, ?, 1, ?, ?)
+    ON CONFLICT(turtle_id, block_type, session_start) 
+    DO UPDATE SET count = count + 1, last_mined = ?
+  `);
+  const now = Date.now();
+  const sessionStart = now - (now % (24 * 60 * 60 * 1000)); // Start of day
+  stmt.run(turtleId, blockType, sessionStart, now, now);
+}
+
+export function getMiningStats(turtleId = null, days = 7) {
+  const cutoff = Date.now() - (days * 24 * 60 * 60 * 1000);
+  
+  if (turtleId) {
+    const stmt = db.prepare(`
+      SELECT block_type, SUM(count) as total_count 
+      FROM mining_stats 
+      WHERE turtle_id = ? AND session_start >= ?
+      GROUP BY block_type
+      ORDER BY total_count DESC
+    `);
+    return stmt.all(turtleId, cutoff);
+  } else {
+    const stmt = db.prepare(`
+      SELECT turtle_id, block_type, SUM(count) as total_count 
+      FROM mining_stats 
+      WHERE session_start >= ?
+      GROUP BY turtle_id, block_type
+      ORDER BY turtle_id, total_count DESC
+    `);
+    return stmt.all(cutoff);
+  }
+}
+
+export function getTopMiners(limit = 10) {
+  const stmt = db.prepare(`
+    SELECT turtle_id, SUM(count) as total_blocks
+    FROM mining_stats
+    GROUP BY turtle_id
+    ORDER BY total_blocks DESC
+    LIMIT ?
+  `);
+  return stmt.all(limit);
+}
+
+// Turtle Groups/Teams
+export function createGroup(groupName, color = '#3b82f6') {
+  const stmt = db.prepare(`
+    INSERT INTO turtle_groups (group_name, color, created_at)
+    VALUES (?, ?, ?)
+  `);
+  const result = stmt.run(groupName, color, Date.now());
+  return result.lastInsertRowid;
+}
+
+export function getAllGroups() {
+  const stmt = db.prepare('SELECT * FROM turtle_groups ORDER BY created_at DESC');
+  return stmt.all();
+}
+
+export function deleteGroup(groupId) {
+  const stmt = db.prepare('DELETE FROM turtle_groups WHERE id = ?');
+  stmt.run(groupId);
+}
+
+export function addTurtleToGroup(turtleId, groupId) {
+  const stmt = db.prepare(`
+    INSERT OR IGNORE INTO turtle_group_members (turtle_id, group_id, joined_at)
+    VALUES (?, ?, ?)
+  `);
+  stmt.run(turtleId, groupId, Date.now());
+}
+
+export function removeTurtleFromGroup(turtleId, groupId) {
+  const stmt = db.prepare(`
+    DELETE FROM turtle_group_members 
+    WHERE turtle_id = ? AND group_id = ?
+  `);
+  stmt.run(turtleId, groupId);
+}
+
+export function getGroupMembers(groupId) {
+  const stmt = db.prepare(`
+    SELECT turtle_id, joined_at 
+    FROM turtle_group_members 
+    WHERE group_id = ?
+  `);
+  return stmt.all(groupId);
+}
+
+export function getTurtleGroups(turtleId) {
+  const stmt = db.prepare(`
+    SELECT g.*, m.joined_at
+    FROM turtle_groups g
+    JOIN turtle_group_members m ON g.id = m.group_id
+    WHERE m.turtle_id = ?
+  `);
+  return stmt.all(turtleId);
+}
+
+// Session Tracking
+export function startSession(turtleId) {
+  const stmt = db.prepare(`
+    INSERT INTO turtle_sessions (turtle_id, started_at)
+    VALUES (?, ?)
+  `);
+  const result = stmt.run(turtleId, Date.now());
+  return result.lastInsertRowid;
+}
+
+export function endSession(sessionId, blocksMined, distanceTraveled) {
+  const stmt = db.prepare(`
+    UPDATE turtle_sessions 
+    SET ended_at = ?, blocks_mined = ?, distance_traveled = ?
+    WHERE id = ?
+  `);
+  stmt.run(Date.now(), blocksMined, distanceTraveled, sessionId);
+}
+
+export function getSessionStats(turtleId, limit = 10) {
+  const stmt = db.prepare(`
+    SELECT * FROM turtle_sessions 
+    WHERE turtle_id = ? 
+    ORDER BY started_at DESC 
+    LIMIT ?
+  `);
+  return stmt.all(turtleId, limit);
+}
+
 // Cleanup function
 export function closeDatabase() {
   db.close();