Start creating database model

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/ChunkEntity.kt

@@ -0,0 +1,13 @@
+package im.vector.matrix.android.internal.database.model
+
+import io.objectbox.annotation.Entity
+import io.objectbox.annotation.Id
+import io.objectbox.relation.ToMany
+
+@Entity
+class ChunkEntity {
+    @Id var id: Long = 0
+    var prevToken: String? = null
+    var nextToken: String? = null
+    lateinit var events: ToMany<EventEntity>
+}

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/EventEntity.kt

@@ -0,0 +1,14 @@
+package im.vector.matrix.android.internal.database.model
+
+import io.objectbox.annotation.Entity
+import io.objectbox.annotation.Id
+
+@Entity
+class EventEntity {
+    @Id var id: Long = 0
+    lateinit var eventId: String
+    lateinit var type: String
+    lateinit var content: String
+    var prevContent: String? = null
+    var stateKey: String? = null
+}

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/RoomEntity.kt

@@ -0,0 +1,12 @@
+package im.vector.matrix.android.internal.database.model
+
+import io.objectbox.annotation.Entity
+import io.objectbox.annotation.Id
+import io.objectbox.relation.ToMany
+
+@Entity
+class RoomEntity {
+    @Id var id: Long = 0
+    lateinit var roomId: String
+    lateinit var chunks: ToMany<ChunkEntity>
+}