Implement migrations

buildSrc/src/main/kotlin/Config.kt

@@ -1,6 +1,9 @@
 import org.gradle.api.JavaVersion
 
 object Config {
+    const val migrationCode = 1
+
+    // Tachidesk
     const val tachideskVersion = "v0.6.0"
     // Match this to the Tachidesk-Server commit count
     const val serverCode = 1049