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Hugo Slabbert authored
Previous commit e201b10e added prelimary postgresql support at the cost of breaking mysql-backed caldav. This commit introduces a unixtimestamp() function to output db-specific timestamp query syntax and uses that where needed. mysql.initial.sql is also updated to create a column named `username` rather than `user` in `caldav_props`, as `user` is a reserved keyword in e.g. postgresql.
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