[performance] rewrite timelines to rely on new timeline cache type (#3941)

* start work rewriting timeline cache type

* further work rewriting timeline caching

* more work integration new timeline code

* remove old code

* add local timeline, fix up merge conflicts

* remove old use of go-bytes

* implement new timeline code into more areas of codebase, pull in latest go-mangler, go-mutexes, go-structr

* remove old timeline package, add local timeline cache

* remove references to old timeline types that needed starting up in tests

* start adding page validation

* fix test-identified timeline cache package issues

* fix up more tests, fix missing required changes, etc

* add exclusion for test.out in gitignore

* clarify some things better in code comments

* tweak cache size limits

* fix list timeline cache fetching

* further list timeline fixes

* linter, ssssssssshhhhhhhhhhhh please

* fix linter hints

* reslice the output if it's beyond length of 'lim'

* remove old timeline initialization code, bump go-structr to v0.9.4

* continued from previous commit

* improved code comments

* don't allow multiple entries for BoostOfID values to prevent repeated boosts of same boosts

* finish writing more code comments

* some variable renaming, for ease of following

* change the way we update lo,hi paging values during timeline load

* improved code comments for updated / returned lo , hi paging values

* finish writing code comments for the StatusTimeline{} type itself

* fill in more code comments

* update go-structr version to latest with changed timeline unique indexing logic

* have a local and public timeline *per user*

* rewrite calls to public / local timeline calls

* remove the zero length check, as lo, hi values might still be set

* simplify timeline cache loading, fix lo/hi returns, fix timeline invalidation side-effects missing for some federated actions

* swap the lo, hi values 🤦

* add (now) missing slice reverse of tag timeline statuses when paging ASC

* remove local / public caches (is out of scope for this work), share more timeline code

* remove unnecessary change

* again, remove more unused code

* remove unused function to appease the linter

* move boost checking to prepare function

* fix use of timeline.lastOrder, fix incorrect range functions used

* remove comments for repeat code

* remove the boost logic from prepare function

* do a maximum of 5 loads, not 10

* add repeat boost filtering logic, update go-structr, general improvements

* more code comments

* add important note

* fix timeline tests now that timelines are returned in page order

* remove unused field

* add StatusTimeline{} tests

* add more status timeline tests

* start adding preloading support

* ensure repeat boosts are marked in preloaded entries

* share a bunch of the database load code in timeline cache, don't clear timelines on relationship change

* add logic to allow dynamic clear / preloading of timelines

* comment-out unused functions, but leave in place as we might end-up using them

* fix timeline preload state check

* much improved status timeline code comments

* more code comments, don't bother inserting statuses if timeline not preloaded

* shift around some logic to make sure things aren't accidentally left set

* finish writing code comments

* remove trim-after-insert behaviour

* fix-up some comments referring to old logic

* remove unsetting of lo, hi

* fix preload repeatBoost checking logic

* don't return on status filter errors, these are usually transient

* better concurrency safety in Clear() and Done()

* fix test broken due to addition of preloader

* fix repeatBoost logic that doesn't account for already-hidden repeatBoosts

* ensure edit submodels are dropped on cache insertion

* update code-comment to expand CAS accronym

* use a plus1hULID() instead of 24h

* remove unused functions

* add note that public / local timeline requester can be nil

* fix incorrect visibility filtering of tag timeline statuses

* ensure we filter home timeline statuses on local only

* some small re-orderings to confirm query params in correct places

* fix the local only home timeline filter func

internal/cache/cache.go

@@ -46,6 +46,9 @@ type Caches struct {
 	// `[status.ID][status.UpdatedAt.Unix()]`
 	StatusesFilterableFields *ttl.Cache[string, []string]
 
+	// Timelines ...
+	Timelines TimelineCaches
+
 	// Visibility provides access to the item visibility
 	// cache. (used by the visibility filter).
 	Visibility VisibilityCache
@@ -87,12 +90,14 @@ func (c *Caches) Init() {
 	c.initFollowRequest()
 	c.initFollowRequestIDs()
 	c.initFollowingTagIDs()
+	c.initHomeTimelines()
 	c.initInReplyToIDs()
 	c.initInstance()
 	c.initInteractionRequest()
 	c.initList()
 	c.initListIDs()
 	c.initListedIDs()
+	c.initListTimelines()
 	c.initMarker()
 	c.initMedia()
 	c.initMention()
@@ -109,6 +114,7 @@ func (c *Caches) Init() {
 	c.initStatusEdit()
 	c.initStatusFave()
 	c.initStatusFaveIDs()
+	c.initStatusesFilterableFields()
 	c.initTag()
 	c.initThreadMute()
 	c.initToken()
@@ -120,7 +126,6 @@ func (c *Caches) Init() {
 	c.initWebPushSubscription()
 	c.initWebPushSubscriptionIDs()
 	c.initVisibility()
-	c.initStatusesFilterableFields()
 }
 
 // Start will start any caches that require a background
@@ -207,6 +212,8 @@ func (c *Caches) Sweep(threshold float64) {
 	c.DB.User.Trim(threshold)
 	c.DB.UserMute.Trim(threshold)
 	c.DB.UserMuteIDs.Trim(threshold)
+	c.Timelines.Home.Trim()
+	c.Timelines.List.Trim()
 	c.Visibility.Trim(threshold)
 }