Relay: consumers do not receive root block in case of too big seq commit

[dholms]

From bluesky-social/atproto#2893

[MarshalX]

line no. 642 🤔

indigo/events/dbpersist.go

Lines 640 to 645 in 983ce4a

	if len(cs) > carstore.MaxSliceLength {
	out.TooBig = true
	out.Blocks = []byte{}
	} else {
	out.Blocks = cs
	}

upd. summoning guru of that file @whyrusleeping :) (idk will the edit trigger subscribe to this issue)

[MarshalX]

hi @whyrusleeping could you pls take a look?