Refactor and remove sqlite and replace with MySQL

internal/models/syndicate.go

@@ -0,0 +1,41 @@
+package models
+
+import (
+	"database/sql"
+	"time"
+)
+
+type Syndicate struct {
+	ID          int
+	OwnerID     int
+	Name        string
+	Description string
+	CreatedBy   int
+	CreatedAt   time.Time
+}
+
+type SyndicateMember struct {
+	ID          int
+	SyndicateID int
+	UserID      int
+	Role        string
+	JoinedAt    time.Time
+}
+
+type SyndicateInvite struct {
+	ID            int
+	SyndicateID   int
+	InvitedUserID int
+	SentByUserID  int
+	Status        string
+	CreatedAt     time.Time
+}
+
+type SyndicateInviteToken struct {
+	Token            string
+	InvitedByUserID  int
+	AcceptedByUserID sql.NullInt64
+	CreatedAt        time.Time
+	ExpiresAt        time.Time
+	AcceptedAt       sql.NullTime
+}