Removed tests. included watch patterns for ktor auto reloading. Returned proper responses upon transaction failures.

build.gradle.kts

@@ -1,4 +1,3 @@
-val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
@@ -33,6 +32,4 @@ dependencies {
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.1")
     implementation("org.slf4j:slf4j-api:2.0.16")
     implementation("com.zaxxer:HikariCP:6.0.0")
-    testImplementation("io.ktor:ktor-server-test-host-jvm")
-    testImplementation("org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version")
 }