Add booking travel cities and member relation

src/main/kotlin/com/android/trisolarisserver/models/booking/Booking.kt

@@ -74,6 +74,16 @@ class Booking(
     @Column(name = "expected_guest_count")
     var expectedGuestCount: Int? = null,
 
+    @Column(name = "from_city")
+    var fromCity: String? = null,
+
+    @Column(name = "to_city")
+    var toCity: String? = null,
+
+    @Enumerated(EnumType.STRING)
+    @Column(name = "member_relation")
+    var memberRelation: MemberRelation? = null,
+
     var notes: String? = null,
 
     @ManyToOne(fetch = FetchType.LAZY)

src/main/kotlin/com/android/trisolarisserver/models/booking/MemberRelation.kt

@@ -0,0 +1,8 @@
+package com.android.trisolarisserver.models.booking
+
+enum class MemberRelation {
+    FRIENDS,
+    FAMILY,
+    GROUP,
+    ALONE
+}