Add defines for cleanup statements

[stelfrag]

Summary

• Add defines for some cleanup statements

[thiagoftsm]

I didn’t find any issues, but I did notice the following warning:

/home/thiago/Netdata/tests_netdata/src/database/sqlite/sqlite_metadata.c: In function 'store_hosts_metadata':
/home/thiago/Netdata/tests_netdata/src/database/sqlite/sqlite_metadata.c:2404:9: warning: 'started_ut' may be used uninitialized [-Wmaybe-uninitialized]
 2404 |         COMPUTE_DURATION(report_duration, "us", started_ut, now_monotonic_usec());
      |         ^
/home/thiago/Netdata/tests_netdata/src/database/sqlite/sqlite_metadata.c:2369:12: note: 'started_ut' was declared here
 2369 |     usec_t started_ut;
      |            ^

Would you prefer to address this warning in this PR or in a separate one?

[stelfrag]

Would you prefer to address this warning in this PR or in a separate one?

I adjusted the code (although it was not a problem)

[thiagoftsm]

After the last commit, all warnings have been resolved and the PR is working as expected. LGTM!