Pricing

from $0.15 / actor start

Delta-Sync Sentinel

RAG Pipeline, Agentic Infrastructure, Idempotent Ingestion — transactional-outbox delta sync engine with deterministic chunk IDs and lease/fencing tokens. Safe to re-run; manifest-commit is the source of truth.

Pricing

from $0.15 / actor start

Rating

0.0

(0)

Developer

Nathan Carter

Actor stats

Bookmarked

Total users

Monthly active users

5 days ago

Last modified

Categories

Developer tools

Operation

Optional

Selects the state-machine verb. 'sync': fetch sources, stage content-addressed chunks, and commit one new manifest at cursor+1. 'reconcile': re-emit every already-committed manifest with cursor >= fromCursor, reconstructing chunks from durable storage with their original deterministic ids — use this to recover a downstream consumer that fell behind or dropped data, never to 'redo' work. 'health': return the {status, staleness_s, last_cursor} snapshot and exit without writing anything.

Type:string

Default:sync

Options:

syncreconcilehealth

Source URLs

sources

Optional

http(s) URLs to fetch and split into deterministic chunks. Required when op = 'sync', ignored otherwise. Each source is sectioned on markdown headings when present, or packed into ~chunkSizeChars windows on paragraph boundaries when not — either way, the same source content always produces the same section boundaries, which is what makes chunk_id stable across re-runs.

Type:array

From Cursor

fromCursor

Optional

Used only when op = 'reconcile'. Re-emits every committed manifest whose cursor is >= this value, in cursor order, using the original deterministic chunk_ids. Set to your last known-good cursor + 1 to backfill exactly the gap a consumer missed — replay is safe because consumers upsert on chunk_id rather than append.

Type:integer

Minimum:0

Default:0

Max Cost (USD)

maxCostUsd

Required

Hard spending ceiling. Checked before every chunk is staged — if internal execution cost projects to exceed this value, the actor self-terminates immediately (CostCeilingError) rather than staging the chunk, so a triggered ceiling never leaves a committed manifest. Prevents runaway billing on unexpectedly large sources. Accepts a decimal string, e.g. '5.00' — string rather than number because the Apify input form has no float type; the actor coerces it internally.

Type:string

Cost Per Chunk (USD, optional)

costPerChunkUsd

Optional

Override for the assumed marginal cost of staging one chunk, used only to project against maxCostUsd. Defaults to 0.0005 if omitted. Same string-for-float reasoning as maxCostUsd.

Type:string

Base Cost (USD, optional)

baseCostUsd

Optional

Override for the assumed fixed cost of a run (container start, initial fetch) before any chunk is staged, used only to project against maxCostUsd. Defaults to 0.01 if omitted. If this alone exceeds maxCostUsd, the run is rejected at validation before any network call is made.

Type:string

Chunk Size (chars)

chunkSizeChars

Optional

Target chunk size in characters, used only as a fallback when a source has no markdown headings to section on. Does not affect chunk_id derivation directly — the resulting section content does, so changing this value after a source has already been synced will produce new chunk_ids for that source on the next sync.

Type:integer

Minimum:200

Default:1200

Heartbeat Interval (s)

heartbeatIntervalSecs

Optional

How often the lease heartbeat is refreshed in the KV store while this run holds it. Must stay well under the 90-second zombie-detection threshold (see README) or a live run risks having its own lease stolen out from under it.

Type:integer

Minimum:5

Default:20

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