[Clas12_calcom] Micromegas DAQ constants update

[Raffaella De Vita]

Dear Guillaume,
given the type of modification you need, I would be in favor of deleting 
and recreating the table with the additional colums. Since there is only 
one entry, it would take a few minutes to do the change.
Best regards,
     Raffaella

Francois-Xavier Girod wrote:
> Dear Guillaume
>
> I am not currently doing any mass decoding. I see a couple people 
> doing simulations on the batch farm, although I doubt they could be 
> affected.
>
> Best regards
> FX
>
> On Fri, Feb 16, 2018 at 3:35 PM, Guillaume CHRISTIAENS 
> <guillaum at jlab.org <mailto:guillaum at jlab.org>> wrote:
>
>     Hi all,
>
>     In order to reduce Micromegas data size, we now use "sparse
>     samples" in MVT. To compute a time information correctly we need
>     this information to be accessible during the decoding.
>
>     Since it's an electronic feature that we didn't know before facing
>     this data size issue, ccdb table was not made to hold this
>     information. Then I would like to add 2 constants and thus 2
>     columns to the current DAQ table for micromegas (/daq/config/bmt).
>     It's only a 1-row table so not too heavy.
>
>     I think the only ways to add columns are to delete the table and
>     create a new one, or to create a duplicate table with a different
>     name (like /daq/config/bmt2). Even if it's not the spirit of ccdb,
>     I clearly prefer the first solution, to keep clean and clear
>     tables, and since it's just adding column, retro-compatibility
>     will be fine.
>
>     The only issue I see is if someone is decoding a file at the
>     moment the table is deleted and then created again, he may have
>     errors.
>
>     What do you think ?
>
>     Regards,
>
>     Guillaume
>
>
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