Add rate plans, room stay rates, and payments ledger

src/main/kotlin/com/android/trisolarisserver/models/room/RoomStay.kt

@@ -33,6 +33,19 @@ class RoomStay(
     @Column(name = "to_at", columnDefinition = "timestamptz")
     var toAt: OffsetDateTime? = null,   // null = active
 
+    @Enumerated(EnumType.STRING)
+    @Column(name = "rate_source")
+    var rateSource: RateSource? = null,
+
+    @Column(name = "nightly_rate")
+    var nightlyRate: Long? = null,
+
+    @Column(name = "rate_plan_code")
+    var ratePlanCode: String? = null,
+
+    @Column(name = "currency")
+    var currency: String? = null,
+
     @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "created_by")
     var createdBy: AppUser? = null,