flush logs at toplevel

[bennn]

todo

• [x] test, does it actually post a log for every open form?
• [ ] decide if we really want this and its time + data + analysis costs

[bennn]

Tests passed. When I run a file a that opens a file b that opens another file c, 3 logs appear in the DB.

[tnelson]

Need script or Racket func to invoke that will wipe out local log cache.