Query db using 'mid'

[fpavogt]

Describe the change

It would be very useful to have the possibility of querying the db using specific mid values, e.g. RS41. At the moment, unless I missed something, we can query the db using:

• product id pid using pid(val)
• serial number srn using srn(val)
• event id eid using tags("e:val")
• datetime dt using dt("val", "==")
• tag values using tags("val")

We cannot query using object id oid, but this is not critical (I think) because it is something set by the system, and therefore not something known a priori by the user. The mid info, however, is very much known to the user, that may be tempted to use to process all profiles from a given radiosonde model.

@modolol: What do you think ? Is there any db-related black magic that could make this addition difficult ?

There are ways around (e.g. query all flights, and only then select the ones with the correct mid values, add the mid value as a tag), but having the mid query would be the most elegant, no ?

[modolol]

Requests using oid(<id>) should work. Adding mid to the available commands should be done easily.

[modolol]

Can you please check this two features in my last push (branch develop_mol, commit cc30c83541f25fd79499fa91866cab249d0c1aa7)?

[fpavogt]

It works for both oid and mid ! We should add these commands to the doc, in creating_recipes.rst under the Event filtering syntax section (where sn should also be changed to srn).