The program can't delete or modify columns when the database is over 4GB

Details for the issue

What did you do?

1. I have a 4.6 GB SQLite database file with 39 columns and 2 million rows.
2. I created a new column, which by default was called field40 and was set to INTEGER.
3. I tried to rename the column, but the operation failed after hanging for a few minutes.
4. I tried to change the column's type, but that operation also failed after hanging for a few minutes.
5. The above operations appear to have partially corrupted the database. SQLite Browser can still open it and read to it, but Python's sqlite3 library now reports this error: sqlite3.DatabaseError: database disk image is malformed

What did you expect to see?

It's understandable that a 4.6 GB file would be very slow to work with, but the operations shouldn't fail entirely.

What did you see instead?

The above operations should succeed, even if they take a while to perform.

Useful extra information

What operating system are you using?

Windows 10 64-bit

What is your DB4S version?

3.11.2

Did you also

• Try out the latest nightly version: https://github.com/sqlitebrowser/sqlitebrowser#nightly-builds
• Search for an existing similar issue: https://github.com/sqlitebrowser/sqlitebrowser/issues?utf8=%E2%9C%93&q=is%3Aissue%20

No source files or tests are named. Start by reproducing the rename and type-change operations on a 4.6 GB SQLite database with 39 columns and 2 million rows, then trace the column-modification path. Done means both operations complete without hanging or leaving the database malformed.