CORE-16329 - Avro and DB schema for new Scheduler component. (#1218)

Avro and DB schema for new Scheduler component.

data/avro-schema/src/main/resources/avro/net/corda/data/scheduler/ScheduledTaskTrigger.avsc

@@ -0,0 +1,20 @@
+{
+  "type": "record",
+  "name": "ScheduledTaskTrigger",
+  "namespace": "net.corda.data.scheduler",
+  "fields": [
+    {
+      "name": "name",
+      "type": "string",
+      "doc": "Name of the scheduled task."
+    },
+    {
+      "name": "timestamp",
+      "type": {
+          "type": "long",
+          "logicalType": "timestamp-millis"
+          },
+      "doc": "Timestamp for the trigger."
+    }
+  ]
+}

data/db-schema/src/main/resources/net/corda/db/schema/config/db.changelog-master.xml

@@ -8,4 +8,5 @@
     <include file="net/corda/db/schema/config/migration/static-network-creation-v1.0.xml"/>
 
     <include file="net/corda/db/schema/config/migration/config-creation-v5.1.xml"/>
+    <include file="net/corda/db/schema/config/migration/scheduler-creation-v5.1.xml"/>
 </databaseChangeLog>

data/db-schema/src/main/resources/net/corda/db/schema/config/migration/scheduler-creation-v5.1.xml

@@ -0,0 +1,25 @@
+<?xml version="1.1" encoding="UTF-8" standalone="no"?>
+<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-4.3.xsd">
+
+    <property name="now" value="now()" dbms="hsqldb"/>
+    <property name="now" value="now()" dbms="postgresql"/>
+
+    <changeSet author="R3.Corda" id="scheduler-creation-v5.1">
+
+        <createTable tableName="task_scheduler_log">
+            <column name="task_name" type="VARCHAR(255)">
+                <constraints nullable="false"/>
+            </column>
+            <column name="last_scheduled" type="TIMESTAMP WITH TIME ZONE" defaultValueDate="${now}">
+                <constraints nullable="false"/>
+            </column>
+            <column name="scheduler_id" type="VARCHAR(255)">
+                <constraints nullable="false"/>
+            </column>
+        </createTable>
+
+        <addPrimaryKey columnNames="task_name" constraintName="task_scheduler_log_task_name_pk" tableName="task_scheduler_log"/>
+    </changeSet>
+</databaseChangeLog>