Investigate inception bbn timestamp needed for UX

[gusin13]

No description provided.

[jrwbabylonlab]

type IndexerDelegationPagination struct {
	StakingTxHashHex string `json:"staking_tx_hash_hex"`
	StartHeight      uint32 `json:"start_height"`
}

once the timestamp value has been added in the indexer db for delegation collection, the pagination token logic in the API service shall also be updated.
Right now the StartHeight is 0 for EOI as there is no such tx exist in BTC yet. We should probably sort by the BBN height or timestamp instead.

i.e we shall save both BBN height and its timestamp in delegation collection @gusin13

fyi @jeremy-babylonlabs

[gusin13]

sure can save both, basically we need
eoi_bbn_height
eoi_bbn_timestamp

where inception means EOI is created in babylon

[jrwbabylonlab]

@gusin13 i think this issue has already been taking care of from your latest api PR, right?

[jrwbabylonlab]

Please ping in team channel once backend has been released as we need to apply FE changes