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b2de59d486wallet, bdbro: Validate btree page levels (Ava Chow)dc3a2b9c3bwallet, bdbro: Enforce overflow data lengths (Ava Chow) Pull request description: Alternative to #34946 BDB's overflow records include the total length of the data to be read from the overflow pages. If this length is impossible (larger than max page * page size), or if the data that we are reading exceeds the stated length, then throw an exception as this is an invalid BDB file. This prevents infinite looping if an overflow page makes a circular reference. BDB BTrees also include the level in the tree that the page is supposed to be at. Leaf pages are always at level 1. Starting from the root page, we can validate that each child has a level one less than the parent, until we reach a leaf page with a level of 1. This also ensures that we cannot have circular internal page references. ACKs for top commit: sedited: ACKb2de59d486rkrux: code review ACKb2de59d486Tree-SHA512: b740c349f68c78150ee57b77e8e81605bb45a7db4fbca3c3a0d87318178dfa197f37faf0cbfd8bef791ab20f4a9afc3d2571842960055a70b6c081d605f59f94