Flight Importer Not Considering Days

[FatihKoz]

While importing flights via csv, importer does not check/consider days to match current flights. Thus updating the last record always.

airline,flight_number,route_code,callsign,route_leg,dpt_airport,arr_airport,alt_airport,days,dpt_time,arr_time,level,distance,flight_time,flight_type,load_factor,load_factor_variance,pilot_pay,route,notes,start_date,end_date,active,subfleets,fares,fields,event_id,user_id
THY,48,,,,EDDF,EDDV,,5,09:05,09:55,,152.52,50,J,91,19,,,,,,1,A320,,,,
THY,48,,,,EDDF,EDDV,,6,09:00,09:50,,152.52,50,J,83,14,,,,,,1,B738,,,,
THY,48,,,,EDDF,EDDV,,7,09:10,10:00,,152.52,50,J,84,19,,,,,,1,A321,,,,

In the above example, we should have 3 different flights, on 3 different days.

We can create those flights manually and can export. Only import fails.

Version
Latest dev as of date.

To Reproduce
Steps to reproduce the behavior:

1. Use the above csv example
2. Import those flights
3. Check the result
4. See error (you will have only one flight, updated to have 3 subfleets),

Expected behavior
Flights on different days may have different times and equipment, even though they can share the same flight number they should be considered as different flights in our environment.