use antigravity to rewrite all your code to migrate from flat files to relational database. YOLO

server/main.go

@@ -6,37 +6,14 @@ import (
 	"log"
 	"net/http"
 	"os"
-	"sync"
 	"time"
+
+	_ "github.com/go-sql-driver/mysql"
 )
 
-var (
-	stepManagers = make(map[string]*StepManager) // userID -> StepManager
-	smMutex      sync.RWMutex
-)
-
-// getOrCreateStepManager retrieves or creates a StepManager for the given user
-func getOrCreateStepManager(userID string) *StepManager {
-	smMutex.RLock()
-	sm, exists := stepManagers[userID]
-	smMutex.RUnlock()
-
-	if exists {
-		return sm
-	}
-
-	// Create new StepManager for this user
-	smMutex.Lock()
-	defer smMutex.Unlock()
-
-	// Double-check it wasn't created while we were waiting for the lock
-	if sm, exists := stepManagers[userID]; exists {
-		return sm
-	}
-
-	sm = NewStepManager(userID)
-	stepManagers[userID] = sm
-	return sm
+// getStepManager creates a new StepManager for the given user, loading state from DB
+func getStepManager(userID string) *StepManager {
+	return NewStepManager(userID)
 }
 
 func initTimezone() {
@@ -58,9 +35,8 @@ func initTimezone() {
 func main() {
 	// Initialize components
 	initTimezone()
+	InitDB()
 	InitFitbit()
-	InitUserRegistry()
-	InitVoteRegistry()
 
 	// 1. Serve Static Files (Frontend)
 	fs := http.FileServer(http.Dir("frontend"))
@@ -69,19 +45,19 @@ func main() {
 	// 2. API Endpoints (all require authentication)
 	http.HandleFunc("/api/status", RequireAuth(func(w http.ResponseWriter, r *http.Request) {
 		userID, _ := getUserID(r.Context())
-		sm := getOrCreateStepManager(userID)
+		sm := getStepManager(userID)
 
 		status := sm.GetStatus()
 
 		// Add user info to status
-		user, exists := userRegistry.GetUser(userID)
-		if exists && user != nil {
+		user, err := GetUser(userID)
+		if err == nil && user != nil {
 			status["user"] = map[string]string{
 				"displayName": user.DisplayName,
 				"avatarUrl":   user.AvatarURL,
 			}
 		} else {
-			fmt.Printf("[API Status] WARNING: User info not found for ID: %s (exists=%v)\n", userID, exists)
+			fmt.Printf("[API Status] WARNING: User info not found for ID: %s (err=%v)\n", userID, err)
 		}
 
 		w.Header().Set("Content-Type", "application/json")
@@ -95,7 +71,7 @@ func main() {
 		}
 
 		userID, _ := getUserID(r.Context())
-		sm := getOrCreateStepManager(userID)
+		sm := getStepManager(userID)
 		sm.Sync()
 		w.WriteHeader(http.StatusOK)
 	}))
@@ -107,7 +83,7 @@ func main() {
 		}
 
 		userID, _ := getUserID(r.Context())
-		sm := getOrCreateStepManager(userID)
+		sm := getStepManager(userID)
 		sm.StartNewTrip()
 		w.WriteHeader(http.StatusOK)
 	}))
@@ -119,7 +95,7 @@ func main() {
 		}
 
 		userID, _ := getUserID(r.Context())
-		sm := getOrCreateStepManager(userID)
+		sm := getStepManager(userID)
 		go sm.Drain() // Async so we don't block
 		w.WriteHeader(http.StatusOK)
 	}))