Improve tracing for sqlalchemy:

1) Make it work during migrations with custom types
2) It works more optimal (we don't need to render
2 times sql expressions)

Add alternative way to turn of wsgi middleware via python
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQEcBAABAgAGBQJTvaORAAoJEDvpPTuJuon05a4H/iEXdk52r2gDuk6ujdtON7Gg
tbiGS2Ya6qh0Wag8L28/8HRO5zzrIFtl0PNLjg7lMJzbF8OXXgnMG5NcAa2eI+SM
4p1aEeP55LwuPMGhdg3058iXqUn3S8MBi2sLq6Elw9OTTL9EN2mDhDJrxqsEjR+b
UhmOYvgKxZr5TNYjPj2bSnAMYho6Sx3K3Srlg2aFOL+BXOlf66HiW8iecEKIScp9
nzSbqHppwBOFLb4ek7j6TMPRU7a9t+JSsE/iKKkHBxGDFNM8pugvGUVm+EZW2Dv3
qbyLNg671uM7VVJBBMSYrMGQol6gU9OIR2DZfsrBzhO5lrWK5PiiOR/3GVo47QA=
=zzXz
-----END PGP SIGNATURE-----