SIO-1252 Force database string identifiers to be lowercase

Allowed character in model identifiers were inconsistent with urls
pointing to them. We are forcing lowercase identifiers, as some database
collations use case insensitive string comparison.

Change-Id: I0e44823c076c479a9877bdc6f57a953d619360e4
Merge "SIO-1252 Force database string identifiers to be lowercase"