[feature/performance] Store account stats in separate table (#2831)

* [feature/performance] Store account stats in separate table, get stats from remote

* test account stats

* add some missing increment / decrement calls

* change stats function signatures

* rejig logging a bit

* use lock when updating stats

internal/processing/workers/fromclientapi.go

@@ -247,6 +247,11 @@ func (p *clientAPI) CreateStatus(ctx context.Context, cMsg messages.FromClientAP
 		return gtserror.Newf("%T not parseable as *gtsmodel.Status", cMsg.GTSModel)
 	}
 
+	// Update stats for the actor account.
+	if err := p.utilF.incrementStatusesCount(ctx, cMsg.OriginAccount, status); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	if err := p.surface.timelineAndNotifyStatus(ctx, status); err != nil {
 		log.Errorf(ctx, "error timelining and notifying status: %v", err)
 	}
@@ -311,6 +316,11 @@ func (p *clientAPI) CreateFollowReq(ctx context.Context, cMsg messages.FromClien
 		return gtserror.Newf("%T not parseable as *gtsmodel.FollowRequest", cMsg.GTSModel)
 	}
 
+	// Update stats for the target account.
+	if err := p.utilF.incrementFollowRequestsCount(ctx, cMsg.TargetAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	if err := p.surface.notifyFollowRequest(ctx, followRequest); err != nil {
 		log.Errorf(ctx, "error notifying follow request: %v", err)
 	}
@@ -360,6 +370,11 @@ func (p *clientAPI) CreateAnnounce(ctx context.Context, cMsg messages.FromClient
 		return gtserror.Newf("%T not parseable as *gtsmodel.Status", cMsg.GTSModel)
 	}
 
+	// Update stats for the actor account.
+	if err := p.utilF.incrementStatusesCount(ctx, cMsg.OriginAccount, boost); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	// Timeline and notify the boost wrapper status.
 	if err := p.surface.timelineAndNotifyStatus(ctx, boost); err != nil {
 		log.Errorf(ctx, "error timelining and notifying status: %v", err)
@@ -485,6 +500,20 @@ func (p *clientAPI) AcceptFollow(ctx context.Context, cMsg messages.FromClientAP
 		return gtserror.Newf("%T not parseable as *gtsmodel.Follow", cMsg.GTSModel)
 	}
 
+	// Update stats for the target account.
+	if err := p.utilF.decrementFollowRequestsCount(ctx, cMsg.TargetAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
+	if err := p.utilF.incrementFollowersCount(ctx, cMsg.TargetAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
+	// Update stats for the origin account.
+	if err := p.utilF.incrementFollowingCount(ctx, cMsg.OriginAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	if err := p.surface.notifyFollow(ctx, follow); err != nil {
 		log.Errorf(ctx, "error notifying follow: %v", err)
 	}
@@ -502,6 +531,11 @@ func (p *clientAPI) RejectFollowRequest(ctx context.Context, cMsg messages.FromC
 		return gtserror.Newf("%T not parseable as *gtsmodel.FollowRequest", cMsg.GTSModel)
 	}
 
+	// Update stats for the target account.
+	if err := p.utilF.decrementFollowRequestsCount(ctx, cMsg.TargetAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	if err := p.federate.RejectFollow(
 		ctx,
 		p.converter.FollowRequestToFollow(ctx, followReq),
@@ -518,6 +552,16 @@ func (p *clientAPI) UndoFollow(ctx context.Context, cMsg messages.FromClientAPI)
 		return gtserror.Newf("%T not parseable as *gtsmodel.Follow", cMsg.GTSModel)
 	}
 
+	// Update stats for the origin account.
+	if err := p.utilF.decrementFollowingCount(ctx, cMsg.OriginAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
+	// Update stats for the target account.
+	if err := p.utilF.decrementFollowersCount(ctx, cMsg.TargetAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	if err := p.federate.UndoFollow(ctx, follow); err != nil {
 		log.Errorf(ctx, "error federating follow undo: %v", err)
 	}
@@ -565,6 +609,11 @@ func (p *clientAPI) UndoAnnounce(ctx context.Context, cMsg messages.FromClientAP
 		return gtserror.Newf("db error deleting status: %w", err)
 	}
 
+	// Update stats for the origin account.
+	if err := p.utilF.decrementStatusesCount(ctx, cMsg.OriginAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	if err := p.surface.deleteStatusFromTimelines(ctx, status.ID); err != nil {
 		log.Errorf(ctx, "error removing timelined status: %v", err)
 	}
@@ -603,6 +652,11 @@ func (p *clientAPI) DeleteStatus(ctx context.Context, cMsg messages.FromClientAP
 		log.Errorf(ctx, "error wiping status: %v", err)
 	}
 
+	// Update stats for the origin account.
+	if err := p.utilF.decrementStatusesCount(ctx, cMsg.OriginAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	if status.InReplyToID != "" {
 		// Interaction counts changed on the replied status;
 		// uncache the prepared version from all timelines.

internal/processing/workers/fromclientapi_test.go

@@ -182,11 +182,6 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusWithNotification() {
 			nil,
 			nil,
 		)
-		statusJSON = suite.statusJSON(
-			ctx,
-			status,
-			receivingAccount,
-		)
 	)
 
 	// Update the follow from receiving account -> posting account so
@@ -212,6 +207,12 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusWithNotification() {
 		suite.FailNow(err.Error())
 	}
 
+	statusJSON := suite.statusJSON(
+		ctx,
+		status,
+		receivingAccount,
+	)
+
 	// Check message in home stream.
 	suite.checkStreamed(
 		homeStream,
@@ -285,11 +286,6 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusReply() {
 			suite.testStatuses["local_account_2_status_1"],
 			nil,
 		)
-		statusJSON = suite.statusJSON(
-			ctx,
-			status,
-			receivingAccount,
-		)
 	)
 
 	// Process the new status.
@@ -305,6 +301,12 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusReply() {
 		suite.FailNow(err.Error())
 	}
 
+	statusJSON := suite.statusJSON(
+		ctx,
+		status,
+		receivingAccount,
+	)
+
 	// Check message in home stream.
 	suite.checkStreamed(
 		homeStream,
@@ -451,11 +453,6 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusListRepliesPolicyLis
 			suite.testStatuses["local_account_2_status_1"],
 			nil,
 		)
-		statusJSON = suite.statusJSON(
-			ctx,
-			status,
-			receivingAccount,
-		)
 	)
 
 	// Modify replies policy of test list to show replies
@@ -480,6 +477,12 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusListRepliesPolicyLis
 		suite.FailNow(err.Error())
 	}
 
+	statusJSON := suite.statusJSON(
+		ctx,
+		status,
+		receivingAccount,
+	)
+
 	// Check message in home stream.
 	suite.checkStreamed(
 		homeStream,
@@ -518,11 +521,6 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusListRepliesPolicyLis
 			suite.testStatuses["local_account_2_status_1"],
 			nil,
 		)
-		statusJSON = suite.statusJSON(
-			ctx,
-			status,
-			receivingAccount,
-		)
 	)
 
 	// Modify replies policy of test list to show replies
@@ -552,6 +550,12 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusListRepliesPolicyLis
 		suite.FailNow(err.Error())
 	}
 
+	statusJSON := suite.statusJSON(
+		ctx,
+		status,
+		receivingAccount,
+	)
+
 	// Check message in home stream.
 	suite.checkStreamed(
 		homeStream,
@@ -590,11 +594,6 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusReplyListRepliesPoli
 			suite.testStatuses["local_account_2_status_1"],
 			nil,
 		)
-		statusJSON = suite.statusJSON(
-			ctx,
-			status,
-			receivingAccount,
-		)
 	)
 
 	// Modify replies policy of test list.
@@ -619,6 +618,12 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusReplyListRepliesPoli
 		suite.FailNow(err.Error())
 	}
 
+	statusJSON := suite.statusJSON(
+		ctx,
+		status,
+		receivingAccount,
+	)
+
 	// Check message in home stream.
 	suite.checkStreamed(
 		homeStream,
@@ -654,11 +659,6 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusBoost() {
 			nil,
 			suite.testStatuses["local_account_2_status_1"],
 		)
-		statusJSON = suite.statusJSON(
-			ctx,
-			status,
-			receivingAccount,
-		)
 	)
 
 	// Process the new status.
@@ -674,6 +674,12 @@ func (suite *FromClientAPITestSuite) TestProcessCreateStatusBoost() {
 		suite.FailNow(err.Error())
 	}
 
+	statusJSON := suite.statusJSON(
+		ctx,
+		status,
+		receivingAccount,
+	)
+
 	// Check message in home stream.
 	suite.checkStreamed(
 		homeStream,

internal/processing/workers/fromfediapi.go

@@ -122,7 +122,7 @@ func (p *Processor) ProcessFromFediAPI(ctx context.Context, fMsg messages.FromFe
 
 	// UPDATE SOMETHING
 	case ap.ActivityUpdate:
-		switch fMsg.APObjectType { //nolint:gocritic
+		switch fMsg.APObjectType {
 
 		// UPDATE NOTE/STATUS
 		case ap.ObjectNote:
@@ -133,6 +133,15 @@ func (p *Processor) ProcessFromFediAPI(ctx context.Context, fMsg messages.FromFe
 			return p.fediAPI.UpdateAccount(ctx, fMsg)
 		}
 
+	// ACCEPT SOMETHING
+	case ap.ActivityAccept:
+		switch fMsg.APObjectType { //nolint:gocritic
+
+		// ACCEPT FOLLOW
+		case ap.ActivityFollow:
+			return p.fediAPI.AcceptFollow(ctx, fMsg)
+		}
+
 	// DELETE SOMETHING
 	case ap.ActivityDelete:
 		switch fMsg.APObjectType {
@@ -220,6 +229,11 @@ func (p *fediAPI) CreateStatus(ctx context.Context, fMsg messages.FromFediAPI) e
 		return nil
 	}
 
+	// Update stats for the remote account.
+	if err := p.utilF.incrementStatusesCount(ctx, fMsg.RequestingAccount, status); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	if status.InReplyToID != "" {
 		// Interaction counts changed on the replied status; uncache the
 		// prepared version from all timelines. The status dereferencer
@@ -290,14 +304,20 @@ func (p *fediAPI) CreateFollowReq(ctx context.Context, fMsg messages.FromFediAPI
 	}
 
 	if *followRequest.TargetAccount.Locked {
-		// Account on our instance is locked: just notify the follow request.
+		// Local account is locked: just notify the follow request.
 		if err := p.surface.notifyFollowRequest(ctx, followRequest); err != nil {
 			log.Errorf(ctx, "error notifying follow request: %v", err)
 		}
+
+		// And update stats for the local account.
+		if err := p.utilF.incrementFollowRequestsCount(ctx, fMsg.ReceivingAccount); err != nil {
+			log.Errorf(ctx, "error updating account stats: %v", err)
+		}
+
 		return nil
 	}
 
-	// Account on our instance is not locked:
+	// Local account is not locked:
 	// Automatically accept the follow request
 	// and notify about the new follower.
 	follow, err := p.state.DB.AcceptFollowRequest(
@@ -309,6 +329,16 @@ func (p *fediAPI) CreateFollowReq(ctx context.Context, fMsg messages.FromFediAPI
 		return gtserror.Newf("error accepting follow request: %w", err)
 	}
 
+	// Update stats for the local account.
+	if err := p.utilF.incrementFollowersCount(ctx, fMsg.ReceivingAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
+	// Update stats for the remote account.
+	if err := p.utilF.incrementFollowingCount(ctx, fMsg.RequestingAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	if err := p.federate.AcceptFollow(ctx, follow); err != nil {
 		log.Errorf(ctx, "error federating follow request accept: %v", err)
 	}
@@ -369,6 +399,11 @@ func (p *fediAPI) CreateAnnounce(ctx context.Context, fMsg messages.FromFediAPI)
 		return gtserror.Newf("error dereferencing announce: %w", err)
 	}
 
+	// Update stats for the remote account.
+	if err := p.utilF.incrementStatusesCount(ctx, fMsg.RequestingAccount, boost); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	// Timeline and notify the announce.
 	if err := p.surface.timelineAndNotifyStatus(ctx, boost); err != nil {
 		log.Errorf(ctx, "error timelining and notifying status: %v", err)
@@ -509,6 +544,24 @@ func (p *fediAPI) UpdateAccount(ctx context.Context, fMsg messages.FromFediAPI)
 	return nil
 }
 
+func (p *fediAPI) AcceptFollow(ctx context.Context, fMsg messages.FromFediAPI) error {
+	// Update stats for the remote account.
+	if err := p.utilF.decrementFollowRequestsCount(ctx, fMsg.RequestingAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
+	if err := p.utilF.incrementFollowersCount(ctx, fMsg.RequestingAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
+	// Update stats for the local account.
+	if err := p.utilF.incrementFollowingCount(ctx, fMsg.ReceivingAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
+	return nil
+}
+
 func (p *fediAPI) UpdateStatus(ctx context.Context, fMsg messages.FromFediAPI) error {
 	// Cast the existing Status model attached to msg.
 	existing, ok := fMsg.GTSModel.(*gtsmodel.Status)
@@ -567,6 +620,11 @@ func (p *fediAPI) DeleteStatus(ctx context.Context, fMsg messages.FromFediAPI) e
 		log.Errorf(ctx, "error wiping status: %v", err)
 	}
 
+	// Update stats for the remote account.
+	if err := p.utilF.decrementStatusesCount(ctx, fMsg.RequestingAccount); err != nil {
+		log.Errorf(ctx, "error updating account stats: %v", err)
+	}
+
 	if status.InReplyToID != "" {
 		// Interaction counts changed on the replied status;
 		// uncache the prepared version from all timelines.

internal/processing/workers/fromfediapi_test.go

@@ -55,10 +55,11 @@ func (suite *FromFediAPITestSuite) TestProcessFederationAnnounce() {
 	announceStatus.Visibility = boostedStatus.Visibility
 
 	err := suite.processor.Workers().ProcessFromFediAPI(context.Background(), messages.FromFediAPI{
-		APObjectType:     ap.ActivityAnnounce,
-		APActivityType:   ap.ActivityCreate,
-		GTSModel:         announceStatus,
-		ReceivingAccount: suite.testAccounts["local_account_1"],
+		APObjectType:      ap.ActivityAnnounce,
+		APActivityType:    ap.ActivityCreate,
+		GTSModel:          announceStatus,
+		ReceivingAccount:  suite.testAccounts["local_account_1"],
+		RequestingAccount: boostingAccount,
 	})
 	suite.NoError(err)
 
@@ -115,10 +116,11 @@ func (suite *FromFediAPITestSuite) TestProcessReplyMention() {
 
 	// Send the replied status off to the fedi worker to be further processed.
 	err = suite.processor.Workers().ProcessFromFediAPI(context.Background(), messages.FromFediAPI{
-		APObjectType:     ap.ObjectNote,
-		APActivityType:   ap.ActivityCreate,
-		APObjectModel:    replyingStatusable,
-		ReceivingAccount: suite.testAccounts["local_account_1"],
+		APObjectType:      ap.ObjectNote,
+		APActivityType:    ap.ActivityCreate,
+		APObjectModel:     replyingStatusable,
+		ReceivingAccount:  repliedAccount,
+		RequestingAccount: replyingAccount,
 	})
 	suite.NoError(err)
 
@@ -178,10 +180,11 @@ func (suite *FromFediAPITestSuite) TestProcessFave() {
 	suite.NoError(err)
 
 	err = suite.processor.Workers().ProcessFromFediAPI(context.Background(), messages.FromFediAPI{
-		APObjectType:     ap.ActivityLike,
-		APActivityType:   ap.ActivityCreate,
-		GTSModel:         fave,
-		ReceivingAccount: favedAccount,
+		APObjectType:      ap.ActivityLike,
+		APActivityType:    ap.ActivityCreate,
+		GTSModel:          fave,
+		ReceivingAccount:  favedAccount,
+		RequestingAccount: favingAccount,
 	})
 	suite.NoError(err)
 
@@ -247,10 +250,11 @@ func (suite *FromFediAPITestSuite) TestProcessFaveWithDifferentReceivingAccount(
 	suite.NoError(err)
 
 	err = suite.processor.Workers().ProcessFromFediAPI(context.Background(), messages.FromFediAPI{
-		APObjectType:     ap.ActivityLike,
-		APActivityType:   ap.ActivityCreate,
-		GTSModel:         fave,
-		ReceivingAccount: receivingAccount,
+		APObjectType:      ap.ActivityLike,
+		APActivityType:    ap.ActivityCreate,
+		GTSModel:          fave,
+		ReceivingAccount:  receivingAccount,
+		RequestingAccount: favingAccount,
 	})
 	suite.NoError(err)
 
@@ -318,10 +322,11 @@ func (suite *FromFediAPITestSuite) TestProcessAccountDelete() {
 
 	// now they are mufos!
 	err = suite.processor.Workers().ProcessFromFediAPI(ctx, messages.FromFediAPI{
-		APObjectType:     ap.ObjectProfile,
-		APActivityType:   ap.ActivityDelete,
-		GTSModel:         deletedAccount,
-		ReceivingAccount: receivingAccount,
+		APObjectType:      ap.ObjectProfile,
+		APActivityType:    ap.ActivityDelete,
+		GTSModel:          deletedAccount,
+		ReceivingAccount:  receivingAccount,
+		RequestingAccount: deletedAccount,
 	})
 	suite.NoError(err)
 
@@ -398,10 +403,11 @@ func (suite *FromFediAPITestSuite) TestProcessFollowRequestLocked() {
 	suite.NoError(err)
 
 	err = suite.processor.Workers().ProcessFromFediAPI(ctx, messages.FromFediAPI{
-		APObjectType:     ap.ActivityFollow,
-		APActivityType:   ap.ActivityCreate,
-		GTSModel:         satanFollowRequestTurtle,
-		ReceivingAccount: targetAccount,
+		APObjectType:      ap.ActivityFollow,
+		APActivityType:    ap.ActivityCreate,
+		GTSModel:          satanFollowRequestTurtle,
+		ReceivingAccount:  targetAccount,
+		RequestingAccount: originAccount,
 	})
 	suite.NoError(err)
 
@@ -451,10 +457,11 @@ func (suite *FromFediAPITestSuite) TestProcessFollowRequestUnlocked() {
 	suite.NoError(err)
 
 	err = suite.processor.Workers().ProcessFromFediAPI(ctx, messages.FromFediAPI{
-		APObjectType:     ap.ActivityFollow,
-		APActivityType:   ap.ActivityCreate,
-		GTSModel:         satanFollowRequestTurtle,
-		ReceivingAccount: targetAccount,
+		APObjectType:      ap.ActivityFollow,
+		APActivityType:    ap.ActivityCreate,
+		GTSModel:          satanFollowRequestTurtle,
+		ReceivingAccount:  targetAccount,
+		RequestingAccount: originAccount,
 	})
 	suite.NoError(err)
 
@@ -526,11 +533,12 @@ func (suite *FromFediAPITestSuite) TestCreateStatusFromIRI() {
 	statusCreator := suite.testAccounts["remote_account_2"]
 
 	err := suite.processor.Workers().ProcessFromFediAPI(ctx, messages.FromFediAPI{
-		APObjectType:     ap.ObjectNote,
-		APActivityType:   ap.ActivityCreate,
-		GTSModel:         nil, // gtsmodel is nil because this is a forwarded status -- we want to dereference it using the iri
-		ReceivingAccount: receivingAccount,
-		APIri:            testrig.URLMustParse("http://example.org/users/Some_User/statuses/afaba698-5740-4e32-a702-af61aa543bc1"),
+		APObjectType:      ap.ObjectNote,
+		APActivityType:    ap.ActivityCreate,
+		GTSModel:          nil, // gtsmodel is nil because this is a forwarded status -- we want to dereference it using the iri
+		ReceivingAccount:  receivingAccount,
+		RequestingAccount: statusCreator,
+		APIri:             testrig.URLMustParse("http://example.org/users/Some_User/statuses/afaba698-5740-4e32-a702-af61aa543bc1"),
 	})
 	suite.NoError(err)
 

internal/processing/workers/util.go

@@ -238,3 +238,258 @@ func (u *utilF) redirectFollowers(
 
 	return true
 }
+
+func (u *utilF) incrementStatusesCount(
+	ctx context.Context,
+	account *gtsmodel.Account,
+	status *gtsmodel.Status,
+) error {
+	// Lock on this account since we're changing stats.
+	unlock := u.state.AccountLocks.Lock(account.URI)
+	defer unlock()
+
+	// Populate stats.
+	if account.Stats == nil {
+		if err := u.state.DB.PopulateAccountStats(ctx, account); err != nil {
+			return gtserror.Newf("db error getting account stats: %w", err)
+		}
+	}
+
+	// Update stats by incrementing status
+	// count by one and setting last posted.
+	*account.Stats.StatusesCount++
+	account.Stats.LastStatusAt = status.CreatedAt
+	if err := u.state.DB.UpdateAccountStats(
+		ctx,
+		account.Stats,
+		"statuses_count",
+		"last_status_at",
+	); err != nil {
+		return gtserror.Newf("db error updating account stats: %w", err)
+	}
+
+	return nil
+}
+
+func (u *utilF) decrementStatusesCount(
+	ctx context.Context,
+	account *gtsmodel.Account,
+) error {
+	// Lock on this account since we're changing stats.
+	unlock := u.state.AccountLocks.Lock(account.URI)
+	defer unlock()
+
+	// Populate stats.
+	if account.Stats == nil {
+		if err := u.state.DB.PopulateAccountStats(ctx, account); err != nil {
+			return gtserror.Newf("db error getting account stats: %w", err)
+		}
+	}
+
+	// Update stats by decrementing
+	// status count by one.
+	//
+	// Clamp to 0 to avoid funny business.
+	*account.Stats.StatusesCount--
+	if *account.Stats.StatusesCount < 0 {
+		*account.Stats.StatusesCount = 0
+	}
+	if err := u.state.DB.UpdateAccountStats(
+		ctx,
+		account.Stats,
+		"statuses_count",
+	); err != nil {
+		return gtserror.Newf("db error updating account stats: %w", err)
+	}
+
+	return nil
+}
+
+func (u *utilF) incrementFollowersCount(
+	ctx context.Context,
+	account *gtsmodel.Account,
+) error {
+	// Lock on this account since we're changing stats.
+	unlock := u.state.AccountLocks.Lock(account.URI)
+	defer unlock()
+
+	// Populate stats.
+	if account.Stats == nil {
+		if err := u.state.DB.PopulateAccountStats(ctx, account); err != nil {
+			return gtserror.Newf("db error getting account stats: %w", err)
+		}
+	}
+
+	// Update stats by incrementing followers
+	// count by one and setting last posted.
+	*account.Stats.FollowersCount++
+	if err := u.state.DB.UpdateAccountStats(
+		ctx,
+		account.Stats,
+		"followers_count",
+	); err != nil {
+		return gtserror.Newf("db error updating account stats: %w", err)
+	}
+
+	return nil
+}
+
+func (u *utilF) decrementFollowersCount(
+	ctx context.Context,
+	account *gtsmodel.Account,
+) error {
+	// Lock on this account since we're changing stats.
+	unlock := u.state.AccountLocks.Lock(account.URI)
+	defer unlock()
+
+	// Populate stats.
+	if account.Stats == nil {
+		if err := u.state.DB.PopulateAccountStats(ctx, account); err != nil {
+			return gtserror.Newf("db error getting account stats: %w", err)
+		}
+	}
+
+	// Update stats by decrementing
+	// followers count by one.
+	//
+	// Clamp to 0 to avoid funny business.
+	*account.Stats.FollowersCount--
+	if *account.Stats.FollowersCount < 0 {
+		*account.Stats.FollowersCount = 0
+	}
+	if err := u.state.DB.UpdateAccountStats(
+		ctx,
+		account.Stats,
+		"followers_count",
+	); err != nil {
+		return gtserror.Newf("db error updating account stats: %w", err)
+	}
+
+	return nil
+}
+
+func (u *utilF) incrementFollowingCount(
+	ctx context.Context,
+	account *gtsmodel.Account,
+) error {
+	// Lock on this account since we're changing stats.
+	unlock := u.state.AccountLocks.Lock(account.URI)
+	defer unlock()
+
+	// Populate stats.
+	if account.Stats == nil {
+		if err := u.state.DB.PopulateAccountStats(ctx, account); err != nil {
+			return gtserror.Newf("db error getting account stats: %w", err)
+		}
+	}
+
+	// Update stats by incrementing
+	// followers count by one.
+	*account.Stats.FollowingCount++
+	if err := u.state.DB.UpdateAccountStats(
+		ctx,
+		account.Stats,
+		"following_count",
+	); err != nil {
+		return gtserror.Newf("db error updating account stats: %w", err)
+	}
+
+	return nil
+}
+
+func (u *utilF) decrementFollowingCount(
+	ctx context.Context,
+	account *gtsmodel.Account,
+) error {
+	// Lock on this account since we're changing stats.
+	unlock := u.state.AccountLocks.Lock(account.URI)
+	defer unlock()
+
+	// Populate stats.
+	if account.Stats == nil {
+		if err := u.state.DB.PopulateAccountStats(ctx, account); err != nil {
+			return gtserror.Newf("db error getting account stats: %w", err)
+		}
+	}
+
+	// Update stats by decrementing
+	// following count by one.
+	//
+	// Clamp to 0 to avoid funny business.
+	*account.Stats.FollowingCount--
+	if *account.Stats.FollowingCount < 0 {
+		*account.Stats.FollowingCount = 0
+	}
+	if err := u.state.DB.UpdateAccountStats(
+		ctx,
+		account.Stats,
+		"following_count",
+	); err != nil {
+		return gtserror.Newf("db error updating account stats: %w", err)
+	}
+
+	return nil
+}
+
+func (u *utilF) incrementFollowRequestsCount(
+	ctx context.Context,
+	account *gtsmodel.Account,
+) error {
+	// Lock on this account since we're changing stats.
+	unlock := u.state.AccountLocks.Lock(account.URI)
+	defer unlock()
+
+	// Populate stats.
+	if account.Stats == nil {
+		if err := u.state.DB.PopulateAccountStats(ctx, account); err != nil {
+			return gtserror.Newf("db error getting account stats: %w", err)
+		}
+	}
+
+	// Update stats by incrementing
+	// follow requests count by one.
+	*account.Stats.FollowRequestsCount++
+	if err := u.state.DB.UpdateAccountStats(
+		ctx,
+		account.Stats,
+		"follow_requests_count",
+	); err != nil {
+		return gtserror.Newf("db error updating account stats: %w", err)
+	}
+
+	return nil
+}
+
+func (u *utilF) decrementFollowRequestsCount(
+	ctx context.Context,
+	account *gtsmodel.Account,
+) error {
+	// Lock on this account since we're changing stats.
+	unlock := u.state.AccountLocks.Lock(account.URI)
+	defer unlock()
+
+	// Populate stats.
+	if account.Stats == nil {
+		if err := u.state.DB.PopulateAccountStats(ctx, account); err != nil {
+			return gtserror.Newf("db error getting account stats: %w", err)
+		}
+	}
+
+	// Update stats by decrementing
+	// follow requests count by one.
+	//
+	// Clamp to 0 to avoid funny business.
+	*account.Stats.FollowRequestsCount--
+	if *account.Stats.FollowRequestsCount < 0 {
+		*account.Stats.FollowRequestsCount = 0
+	}
+	if err := u.state.DB.UpdateAccountStats(
+		ctx,
+		account.Stats,
+		"follow_requests_count",
+	); err != nil {
+		return gtserror.Newf("db error updating account stats: %w", err)
+	}
+
+	return nil
+}