add crud repo server and change a lot of different things

ktor/server/src/jvmMain/kotlin/com/insanusmokrassar/postssystem/ktor/server/FlowsWebsocket.kt

@@ -1,12 +1,15 @@
 package com.insanusmokrassar.postssystem.ktor.server
 
 import com.insanusmokrassar.postssystem.ktor.CorrectCloseException
+import com.insanusmokrassar.postssystem.ktor.standardKtorSerialFormat
 import com.insanusmokrassar.postssystem.utils.common.safely
 import io.ktor.http.cio.websocket.*
 import io.ktor.routing.Route
 import io.ktor.websocket.webSocket
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.collect
+import kotlinx.serialization.DeserializationStrategy
+import kotlinx.serialization.SerializationStrategy
 
 private suspend fun DefaultWebSocketSession.checkReceivedAndCloseIfExists() {
     if (incoming.poll() != null) {
@@ -29,3 +32,14 @@ fun <T> Route.includeWebsocketHandling(
         }
     }
 }
+
+fun <T> Route.includeWebsocketHandling(
+    suburl: String,
+    flow: Flow<T>,
+    serializer: SerializationStrategy<T>
+) = includeWebsocketHandling(
+    suburl,
+    flow
+) {
+    standardKtorSerialFormat.encodeToByteArray(serializer, it)
+}

ktor/server/src/jvmMain/kotlin/com/insanusmokrassar/postssystem/ktor/server/ServerRoutingShortcuts.kt

@@ -30,6 +30,14 @@ suspend fun ApplicationCall.getParameterOrSendError(
     field: String
 ) = parameters[field].also {
     if (it == null) {
-        respond(HttpStatusCode.BadRequest, "request must contains $field")
+        respond(HttpStatusCode.BadRequest, "Request must contains $field")
+    }
+}
+
+suspend fun ApplicationCall.getQueryParameterOrSendError(
+    field: String
+) = request.queryParameters[field].also {
+    if (it == null) {
+        respond(HttpStatusCode.BadRequest, "Request query parametersmust contains $field")
     }
 }