Database reorganize, protocol version bump, migrations

buildSrc/build.gradle.kts

@@ -0,0 +1,7 @@
+plugins {
+    `kotlin-dsl`
+}
+
+repositories {
+    mavenCentral()
+}

buildSrc/src/main/kotlin/PhoebenchVersion.kt

@@ -0,0 +1,14 @@
+data class PhoebenchVersion(val major: Int, val minor: Int, val patch: Int, val note: String = "") {
+    operator fun compareTo(other: PhoebenchVersion): Int {
+        // this > other -> return >0
+        val majorComp = major - other.major
+        if(majorComp != 0) return majorComp
+        val minorComp = minor - other.minor
+        if(minorComp != 0) return minorComp
+        return patch - other.patch
+    }
+
+    override fun toString(): String = if(note.isNotBlank()) "$major.$minor.$patch-$note" else safeString()
+
+    fun safeString() = "$major.$minor.$patch"
+}