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wip: add draft algorihm description for newer safer algorithm

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Signed-off-by: Erik Michelson <github@erik.michelson.eu>
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Erik Michelson
2026-05-14 01:09:37 +02:00
parent 51302dbbbc
commit 0b381ae973
1 changed files with 16 additions and 0 deletions
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backend/src/revisions/revisions.service.ts
+16
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@@ -438,6 +438,22 @@ export class RevisionsService {
* Deletes old revisions except the latest one if the clean-up is enabled
*/
async removeOldRevisions(): Promise<void> {
// Algorithm:
// 1. Count all revisions older than revisionRetentionDays -> SQL should return map (noteId, revisionCount)
// 2. Count all revisions exactly as old as revisionRetentionDays or newer for all noteIds found in step 1 -> SQL should return map (noteId, revisionCount)
// 3. Sort noteIds in 3 categories:
// a) noteId has only one revision older than revisionRetentionDays and no newer revision
// b) noteId has multiple revisions older than revisionRetentionDays and no newer revision
// c) noteId has at least one newer revision
// 4. Skip all noteIds from category 3a -> these may not be deleted to avoid data-loss
// 5. Loop over all noteIds from category 3b and do:
// 1. Find newest revision and update `patch` to diff between empty string and `content`
// 2. Delete all revisions for this noteId except the newest revision
// 6. Loop over all noteIds from category 3c and do:
// 1. Find oldest revision that is either exactly as old as or newer than revisionRetentionDays
// 2. Update that revision's `patch` to the diff between empty string and `content`
// 3. Delete all revisions for this noteId older than revisionRetentionDays
const currentTime = getCurrentDateTime();
const revisionRetentionDays: number = this.noteConfig.revisionRetentionDays;
if (revisionRetentionDays <= 0) {