Add database field level encryption level to sensitive data to reduce
the risk in term of data leak. I dedice to have only one key for now in
a near future I may move to one master key and one encryption key per
organization to make rotation easiest.
I don't use built-in pg_crypto function to have clear seperation and
avoid any encryption key leak.
Signed-off-by: Bryan Frimin <bryan@getprobo.com>
