Add the first driver integration test: spins a real PostgreSQL container and
verifies the shared JDBC read path returns stored values and that the write
path binds the point value as a parameter — a SQL-injection payload is stored
verbatim and cannot drop the table, confirming the parameterised-write fix
end-to-end. Set the Failsafe classesDirectory so integration tests run against
the plain compiled classes instead of the Spring Boot repackaged fat jar.
pnoker
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