Optimise sim2_daily database update

At each startup the database is started from zero which takes 5 minutes and fill tha RAM up to 90 Gb...

radis-api-1  | INFO [2025-06-18 10:38:35] Starting SIM2 daily downloads...
radis-api-1  | INFO [2025-06-18 10:38:36] Use cached file data/datagouvfr/QUOT_SIM2_1958-1959.csv.gz
radis-api-1  | INFO [2025-06-18 10:38:36] Use cached file data/datagouvfr/QUOT_SIM2_1960-1969.csv.gz
radis-api-1  | INFO [2025-06-18 10:38:36] Use cached file data/datagouvfr/QUOT_SIM2_1970-1979.csv.gz
radis-api-1  | INFO [2025-06-18 10:38:36] Use cached file data/datagouvfr/QUOT_SIM2_1980-1989.csv.gz
radis-api-1  | INFO [2025-06-18 10:38:36] Use cached file data/datagouvfr/QUOT_SIM2_1990-1999.csv.gz
radis-api-1  | INFO [2025-06-18 10:38:36] Use cached file data/datagouvfr/QUOT_SIM2_2000-2009.csv.gz
radis-api-1  | INFO [2025-06-18 10:38:36] Use cached file data/datagouvfr/QUOT_SIM2_2010-2019.csv.gz
radis-api-1  | INFO [2025-06-18 10:38:36] Use cached file data/datagouvfr/QUOT_SIM2_previous-2020-202505.csv.gz
radis-api-1  | INFO [2025-06-18 10:38:36] Use cached file data/datagouvfr/QUOT_SIM2_latest-20250501-20250617.csv.gz
radis-api-1  | INFO [2025-06-18 10:38:36] Loading data/datagouvfr/QUOT_SIM2_1958-1959.csv.gz...
radis-api-1  | INFO [2025-06-18 10:38:40] Loading data/datagouvfr/QUOT_SIM2_1960-1969.csv.gz...
radis-api-1  | INFO [2025-06-18 10:39:07] Merging QUOT_SIM2_1960-1969.csv.gz...
radis-api-1  | INFO [2025-06-18 10:39:07] Loading data/datagouvfr/QUOT_SIM2_1970-1979.csv.gz...
radis-api-1  | INFO [2025-06-18 10:39:31] Merging QUOT_SIM2_1970-1979.csv.gz...
radis-api-1  | INFO [2025-06-18 10:39:31] Loading data/datagouvfr/QUOT_SIM2_1980-1989.csv.gz...
radis-api-1  | INFO [2025-06-18 10:39:56] Merging QUOT_SIM2_1980-1989.csv.gz...
radis-api-1  | INFO [2025-06-18 10:39:56] Loading data/datagouvfr/QUOT_SIM2_1990-1999.csv.gz...
radis-api-1  | INFO [2025-06-18 10:40:20] Merging QUOT_SIM2_1990-1999.csv.gz...
radis-api-1  | INFO [2025-06-18 10:40:20] Loading data/datagouvfr/QUOT_SIM2_2000-2009.csv.gz...
radis-api-1  | INFO [2025-06-18 10:40:44] Merging QUOT_SIM2_2000-2009.csv.gz...
radis-api-1  | INFO [2025-06-18 10:40:44] Loading data/datagouvfr/QUOT_SIM2_2010-2019.csv.gz...
radis-api-1  | INFO [2025-06-18 10:41:07] Merging QUOT_SIM2_2010-2019.csv.gz...
radis-api-1  | INFO [2025-06-18 10:41:07] Loading data/datagouvfr/QUOT_SIM2_previous-2020-202505.csv.gz...
radis-api-1  | INFO [2025-06-18 10:41:19] Merging QUOT_SIM2_previous-2020-202505.csv.gz...
radis-api-1  | INFO [2025-06-18 10:41:19] Loading data/datagouvfr/QUOT_SIM2_latest-20250501-20250617.csv.gz...
radis-api-1  | INFO [2025-06-18 10:41:19] Merging QUOT_SIM2_latest-20250501-20250617.csv.gz...
radis-api-1  | INFO [2025-06-18 10:41:19] Writing dataset to data/sim2_daily ...
radis-api-1  | INFO [2025-06-18 10:43:02] Dataset data/sim2_daily created.

Instead of merging the whole database in RAM, rows must be merges smartly and only adding one day if the last start has been run for one day.