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Change the pinning, first locate the file that has that pinning in it: https://manpages.debian.org/stretch/apt/apt_preferences.5html Note that jessie I don't believe had all the .d directories yet, so it's hard to remember where its files should go, probably in the .d/ directories will work fine.
The Default-Release is set in: /etc/apt/d/80Basics The Pinning is in: /etc/apt/preferences.d/80Basics In your case, the pinnning is in /etc/apt/preferences Basically you told apt to pin to stable, and it dutifully is doing what you told it to do, only you don't have stable in your sources, you have what is now old stable.
Given this was a stable, not sid or testing installation, I wouldn't in general use that -10 pinning, I'd use something like 100 or 200.
[Updated] Note, I corrected a line in update yours, but your paste shows that was the only item failing, which means your primary jessie main contrib non-free local database is not for some reason updating correctly.
SQL (Structured Query Language) is the most popular database query language in the world.
The main goals of My SQL are speed, robustness and ease of use.
Did anything or anyone change the permissions of the apt database?
Check the following (note in particular the size of the files): ls -l /var/cache/apt # the results should look like this: drwxr-xr-x 3 root root 147456 Jul 22 archives -rw-r--r-- 1 root root 32808269 Aug 13 -rw-r--r-- 1 root root 32088021 Aug 13 which should either show nothing, as was your case until now, or it should show something.