K 10
svn:author
V 4
samm
K 8
svn:date
V 27
2021-01-31T10:47:03.140849Z
K 7
svn:log
V 256
www/trac-devel: allow to select multiply database backends

Trac supports multiply environments with different database backends. Also it
enable usage of the "convert" admin command to migrate between backends

PR:		253115
Reported by:	nork@ninth-nine.com

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