The Chia database (db) is located in the db/ directory inside the .chia/mainnet/ directory. The .chia/ directory will be found in your user's home directory. You will find the testnet database in the same db/ directory if you are using testnet.
- mainnet database filename:
blockchain_v2_mainnet.sqlite - testnet database filename:
blockchain_v2_testnet10.sqlite
Windows Systems
C:\Users\<YOURUSERNAME>
└─ .chia/
└── mainnet/
└─ db/macOS and Linux Systems
/Users/<YOURUSERNAME>
└─ .chia/
└── mainnet/
└─ db/