port 2.10.0 port command errors after selfupdate to 2.10.0

[bal-agates]

I just did an MacPorts selfupdate.

$ sudo port selfupdate
Password:
--->  Updating MacPorts base sources using rsync
MacPorts base version 2.9.3 installed,
MacPorts base version 2.10.0 downloaded.
--->  Updating the ports tree
--->  MacPorts base is outdated, installing new version 2.10.0
Installing new MacPorts release in /opt/local as root:wheel; permissions 0755


The ports tree has been updated. To upgrade your installed ports, you should run
  port upgrade outdated

Now the port command fails no matter what command options are selected.

$ port
sqlite error: attempt to write a readonly database (8) while executing query: CREATE INDEX registry.snapshot_file_id ON snapshot_files(id)
    while executing
"registry::open $db_path"
    (procedure "mportinit" line 832)
    invoked from within
"mportinit ui_options global_options global_variations"
Error: /opt/local/bin/port: Failed to initialize MacPorts, sqlite error: attempt to write a readonly database (8) while executing query: CREATE INDEX registry.snapshot_file_id ON snapshot_files(id)

$ port outdated
sqlite error: attempt to write a readonly database (8) while executing query: CREATE INDEX registry.snapshot_file_id ON snapshot_files(id)
    while executing
"registry::open $db_path"
    (procedure "mportinit" line 832)
    invoked from within
"mportinit ui_options global_options global_variations"
Error: /opt/local/bin/port: Failed to initialize MacPorts, sqlite error: attempt to write a readonly database (8) while executing query: CREATE INDEX registry.snapshot_file_id ON snapshot_files(id)

I have done selfupdate many times in the past without issues. Has something changed in 2.10.0 or are there bugs? What database file is trying to be accessed?

System: macOS 14.6.1 on MacBook Pro 2021 (M1).

[ryandesign (Ryan Carsten Schmidt)]

Duplicate of #70511.