[BUG] v2 DB is not used

[jfikar]

I'm trying to convert v1 DB to v2 DB using btcgreen db upgrade. It seems to work, but an attempt to validate the resulting v2 DB ends with an error:

$ btcgreen db validate
opening file for reading: /home/pi/.btcgreen/mainnet/db/blockchain_v2_mainnet.sqlite
peak hash: d716e4847d7f2fe044702a6995813ea0a897624ac730be86cc4e64734e8bf400
peak height: 1038793
traversing the full chain
0 orphaned blocks: 0       
FAILED: Blockchain has invalid genesis challenge b'6Q\x04\x0b\x10\xc4\x17Q.\xe2Q\xd6NVl\xf7/B\xc9}\x14\xf7\xe0n\xb1\x18\x93\xeb\x14Gw*', expected a41b40c6fbb8941cfa3bd8f1c85ebdeabfd0872c321bb5c1128581d127861585

Even though the upgrade process changed config.yaml to database_path: db/blockchain_v2_CHALLENGE.sqlite, it seems that only the v1 DB is actually used:

ls -l /home/pi/.btcgreen/mainnet/db/
total 17142028
-rw-r--r-- 1 pi pi 9587064832 Mar 20 20:16 blockchain_v1_mainnet.sqlite
-rw-r--r-- 1 pi pi      65536 Mar 20 20:16 blockchain_v1_mainnet.sqlite-shm
-rw-r--r-- 1 pi pi   20983192 Mar 20 20:23 blockchain_v1_mainnet.sqlite-wal
-rw-r--r-- 1 pi pi 7908290560 Mar 20 18:05 blockchain_v2_mainnet.sqlite

If I restart btcgreen with database_path: db/blockchain_v2_CHALLENGE.sqlite, it seems the blockchain_v2_mainnet.sqlite file is updated, but in fact the v1 format is still used. Because if I try:

$ btcgreen db validate
opening file for reading: /home/pi/.btcgreen/mainnet/db/blockchain_v2_mainnet.sqlite
FAILED: Database is missing version table

The same happens for btcgreen 1.3.0 and 1.3.1,