Recover orphaned local tasks after deleting a local calendar (Thunderbird 152.0.1)

Hello, I'm hoping someone can help me recover a local task calendar. Environment Thunderbird 152.0.1 (aarch64) macOS Local Thunderbird calendar (not Google, Exchange, or CalDAV) What happened Several months ago I deleted a local calendar because I believed I was no longer using it. Unfortunately, that calendar contained all of my Thunderbird tasks. After deleting the calendar: the local calendar disappeared from Thunderbird all of my tasks disappeared I have not created any new local tasks since then What I have recovered I have an older copy of my Thunderbird profile from before the deletion. From that profile I have: calendar-data/local.sqlite prefs.js I inspected the SQLite database and confirmed that it contains 394 tasks. The task records appear intact, including task metadata such as: titles categories completion information recurrence tables alarm/snooze tables related Thunderbird calendar metadata All of the recovered tasks belong to the same calendar ID: 8420c0c3-6b20-436c-a39b-d4183d2665e1 Current profile My current profile contains only my two iCloud CalDAV calendars. The deleted local calendar no longer appears in prefs.js. Because of that, the task database appears to be orphaned. What I have already tried Restoring the old local.sqlite Creating a new local calendar Exporting the tasks to ICS and importing them Thunderbird reports: "No importable items found in the file." My question Since the task records still exist in the original local.sqlite, is there a supported way to: recreate the missing local calendar definition so Thunderbird recognizes the existing tasks, or migrate the orphaned tasks into a new local calendar? If necessary, I'm happy to provide: the recovered local.sqlite the current prefs.js any additional profile files My goal is simply to recover the 394 tasks into my current Thunderbird profile without losing any data. Thank you for any guidance.