Add charge ledger for booking commissions

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

@@ -0,0 +1,44 @@
+package com.android.trisolarisserver.models.booking
+
+import com.android.trisolarisserver.models.property.AppUser
+import com.android.trisolarisserver.models.property.Property
+import jakarta.persistence.*
+import java.time.OffsetDateTime
+import java.util.UUID
+
+@Entity
+@Table(name = "charge")
+class Charge(
+    @Id
+    @GeneratedValue
+    @Column(columnDefinition = "uuid")
+    val id: UUID? = null,
+
+    @ManyToOne(fetch = FetchType.LAZY, optional = false)
+    @JoinColumn(name = "property_id", nullable = false)
+    var property: Property,
+
+    @ManyToOne(fetch = FetchType.LAZY, optional = false)
+    @JoinColumn(name = "booking_id", nullable = false)
+    var booking: Booking,
+
+    @Enumerated(EnumType.STRING)
+    @Column(name = "type", nullable = false)
+    var type: ChargeType,
+
+    @Column(name = "amount", nullable = false)
+    var amount: Long,
+
+    @Column(name = "currency", nullable = false)
+    var currency: String,
+
+    @Column(name = "notes")
+    var notes: String? = null,
+
+    @Column(name = "occurred_at", nullable = false, columnDefinition = "timestamptz")
+    var occurredAt: OffsetDateTime = OffsetDateTime.now(),
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "created_by")
+    var createdBy: AppUser? = null
+)

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

@@ -0,0 +1,5 @@
+package com.android.trisolarisserver.models.booking
+
+enum class ChargeType {
+    COMMISSION
+}