Refactor ContactRequest to separate date and time fields, add Flyway for database migrations, and initialize schema.

backend/server/pom.xml

@@ -54,10 +54,10 @@
                     </execution>
                 </executions>
             </plugin>
-<!--            <plugin>-->
-<!--                <groupId>org.springframework.boot</groupId>-->
-<!--                <artifactId>spring-boot-maven-plugin</artifactId>-->
-<!--            </plugin>-->
+            <!--            <plugin>-->
+            <!--                <groupId>org.springframework.boot</groupId>-->
+            <!--                <artifactId>spring-boot-maven-plugin</artifactId>-->
+            <!--            </plugin>-->
         </plugins>
     </build>
 
@@ -92,6 +92,10 @@
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.flywaydb</groupId>
+            <artifactId>flyway-database-postgresql</artifactId>
+        </dependency>
 
         <dependency>
             <groupId>dev.rheinsw</groupId>