added suggestion command

Bot/Helpers/suggestion_db.go

@@ -0,0 +1,70 @@
+package helpers
+
+import (
+	"database/sql"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+var (
+	db     *sql.DB
+	dbOnce sync.Once
+)
+
+func InitSuggestionDB() (*sql.DB, error) {
+	var err error
+	dbOnce.Do(func() {
+		// Create data directory if it doesn't exist
+		dataDir := "data"
+		if err = os.MkdirAll(dataDir, 0755); err != nil {
+			return
+		}
+
+		dbPath := filepath.Join(dataDir, "suggestions.db")
+		db, err = sql.Open("sqlite3", dbPath)
+		if err != nil {
+			return
+		}
+
+		// Create table if it doesn't exist
+		_, err = db.Exec(`
+			CREATE TABLE IF NOT EXISTS suggestion_cooldowns (
+				user_id TEXT PRIMARY KEY,
+				last_submission TIMESTAMP
+			)
+		`)
+	})
+	return db, err
+}
+
+func GetLastSubmission(userID string) (time.Time, error) {
+	var lastSubmission time.Time
+	err := db.QueryRow(`
+		SELECT last_submission FROM suggestion_cooldowns 
+		WHERE user_id = ?
+	`, userID).Scan(&lastSubmission)
+
+	if err == sql.ErrNoRows {
+		return time.Time{}, nil // No record exists
+	}
+	return lastSubmission, err
+}
+
+func SetLastSubmission(userID string) error {
+	_, err := db.Exec(`
+		INSERT OR REPLACE INTO suggestion_cooldowns 
+		(user_id, last_submission) VALUES (?, ?)
+	`, userID, time.Now())
+	return err
+}
+
+func CloseDB() error {
+	if db != nil {
+		return db.Close()
+	}
+	return nil
+}