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

server/db.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+	"os"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+var db *sql.DB
+
+func InitDB() {
+	host := os.Getenv("DB_HOST")
+	port := os.Getenv("DB_PORT")
+	name := os.Getenv("DB_DATABASENAME")
+	user := os.Getenv("DB_USERNAME")
+	pass := os.Getenv("DB_PASSWORD")
+
+	if host == "" {
+		log.Println("DB_HOST not set, skipping database initialization")
+		return
+	}
+
+	dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?parseTime=true", user, pass, host, port, name)
+	var err error
+	db, err = sql.Open("mysql", dsn)
+	if err != nil {
+		log.Fatalf("Error opening database: %v", err)
+	}
+
+	if err := db.Ping(); err != nil {
+		log.Fatalf("Error connecting to database: %v", err)
+	}
+
+	log.Println("Connected to MariaDB successfully")
+	createTables()
+}
+
+func createTables() {
+	queries := []string{
+		`CREATE TABLE IF NOT EXISTS users (
+			fitbit_user_id VARCHAR(255) PRIMARY KEY,
+			display_name VARCHAR(255),
+			avatar_url TEXT,
+			created_at DATETIME
+		)`,
+		`CREATE TABLE IF NOT EXISTS sessions (
+			token VARCHAR(255) PRIMARY KEY,
+			fitbit_user_id VARCHAR(255),
+			created_at DATETIME,
+			expires_at DATETIME,
+			FOREIGN KEY (fitbit_user_id) REFERENCES users(fitbit_user_id) ON DELETE CASCADE
+		)`,
+		`CREATE TABLE IF NOT EXISTS fitbit_tokens (
+			user_id VARCHAR(255) PRIMARY KEY,
+			access_token TEXT,
+			refresh_token TEXT,
+			expires_at DATETIME,
+			FOREIGN KEY (user_id) REFERENCES users(fitbit_user_id) ON DELETE CASCADE
+		)`,
+		`CREATE TABLE IF NOT EXISTS kml_metadata (
+			id INT AUTO_INCREMENT PRIMARY KEY,
+			filename VARCHAR(255),
+			user_id VARCHAR(255),
+			distance DOUBLE,
+			is_public BOOLEAN DEFAULT FALSE,
+			uploaded_at DATETIME,
+			UNIQUE KEY (user_id, filename),
+			FOREIGN KEY (user_id) REFERENCES users(fitbit_user_id) ON DELETE CASCADE
+		)`,
+		`CREATE TABLE IF NOT EXISTS kml_votes (
+			kml_id INT,
+			user_id VARCHAR(255),
+			vote_value INT,
+			PRIMARY KEY (kml_id, user_id),
+			FOREIGN KEY (kml_id) REFERENCES kml_metadata(id) ON DELETE CASCADE,
+			FOREIGN KEY (user_id) REFERENCES users(fitbit_user_id) ON DELETE CASCADE
+		)`,
+		`CREATE TABLE IF NOT EXISTS trips (
+			user_id VARCHAR(255) PRIMARY KEY,
+			start_date VARCHAR(10),
+			start_time DATETIME,
+			start_day_initial_steps INT,
+			previous_total_steps INT,
+			target_total_steps INT,
+			last_sync_time DATETIME,
+			next_sync_time DATETIME,
+			FOREIGN KEY (user_id) REFERENCES users(fitbit_user_id) ON DELETE CASCADE
+		)`,
+		`CREATE TABLE IF NOT EXISTS daily_steps (
+			user_id VARCHAR(255),
+			date VARCHAR(10),
+			steps INT,
+			PRIMARY KEY (user_id, date),
+			FOREIGN KEY (user_id) REFERENCES users(fitbit_user_id) ON DELETE CASCADE
+		)`,
+	}
+
+	for _, query := range queries {
+		if _, err := db.Exec(query); err != nil {
+			log.Fatalf("Error creating table: %v\nQuery: %s", err, query)
+		}
+	}
+	log.Println("Database tables initialized")
+}