fix(sql): Add test verifying precision and adjust precision to 6 to m…

…atch mysql

keel-core/src/main/java/com/netflix/spinnaker/keel/serialization/PrecisionSqlSerializer.java

@@ -35,7 +35,7 @@ public PrecisionSqlSerializer() {
         Instant::toEpochMilli,
         Instant::getEpochSecond,
         Instant::getNano,
-        new DateTimeFormatterBuilder().appendInstant(3).toFormatter());
+        new DateTimeFormatterBuilder().appendInstant(6).toFormatter());
   }
 
   @Override

keel-core/src/test/kotlin/com/netflix/spinnaker/keel/serialization/ObjectMapperSerializationTests.kt

@@ -0,0 +1,34 @@
+package com.netflix.spinnaker.keel.serialization
+
+import dev.minutest.junit.JUnit5Minutests
+import dev.minutest.rootContext
+import org.assertj.core.api.Assertions.assertThat
+import java.time.Instant
+import java.time.LocalDateTime
+import java.time.OffsetDateTime
+import java.time.ZoneOffset
+import java.time.format.DateTimeFormatter
+import java.time.format.DateTimeFormatterBuilder
+
+class ObjectMapperSerializationTests : JUnit5Minutests {
+
+  class ObjectMapperSerializationTestsObject {
+     var date = Instant.from(DateTimeFormatter.ISO_INSTANT.parse("2024-03-10T12:28:19.228816801Z"))
+  }
+
+  fun tests() = rootContext {
+    test("Verify instant precision is no more than 6 characters") {
+      val mapper = configuredObjectMapper()
+      val sampleObject = ObjectMapperSerializationTestsObject()
+      val readBack = mapper.readValue(
+        mapper.writeValueAsString(sampleObject),
+        ObjectMapperSerializationTestsObject::class.java
+      )
+      // 6 precision is the max allowed via str_to_date in SQL.  See
+      // https://dev.mysql.com/doc/refman/8.4/en/date-and-time-type-syntax.html#:~:text=MySQL%20permits%20fractional%20seconds%20for,microseconds%20(6%20digits)%20precision.
+      // SO we want to make sure waht we store matches this
+      val foramt = DateTimeFormatterBuilder().parseCaseInsensitive().appendInstant(6).parseStrict().toFormatter()
+      assertThat(readBack.date).isEqualTo(foramt.format(sampleObject.date))
+    }
+  }
+}