+--------+   +-------+   +----------+
| Client |   |  API  |   | Database |
+----+---+   +---+---+   +----+-----+
     |            |              |
     |  request   |   query      |
     +----------->+------------->
     |            |              |
     |  response  |   result     |
     <------------+<-------------+
     |            |              |
