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## feat/child-run-budget #1160 +/- ##
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vdusek
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`Actor.child_runs` is a sync property that maps each run name to a `RunClientAsync` for the current run under that name. It has the same shape as `Actor.childRuns` in the JS SDK (apify/apify-sdk-js#759). The client covers the run and its storages: ```python run = await Actor.child_runs['scrape-eu'].wait_for_finish() ``` The SDK reads the registry from the default key-value store when the Actor initializes, so runs recorded before a migration or resurrection are included and reading the property makes no API calls. That adds one record read to every init. A malformed record fails the init and leaves the Actor uninitialized. Runs started without a `run_name` aren't tracked. Runs that were replaced under a name stay in the `history` of the `__ACTOR_CHILD_RUNS` record and aren't exposed. A run started or reattached with a custom `token` gets a client with that token. A run recorded before a migration and not reattached since gets the default client, because the token isn't stored. It also fixes a duplicate `max_items` deprecation warning from #1149: a named start that resurrects its recorded run no longer warns a second time from inside the SDK. Docs are in #1160. Closes: #1129 *✍️ Drafted by Claude Code*
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Follow-up to #1149 and #1151 that aligns named child runs with the final version of apify/apify-sdk-js#759. Changes: - A different Actor, task or input under an existing `run_name` raises a `ValueError` only when the recorded run would be reused (reattached, returned as `SUCCEEDED`, or resurrected). When the recorded run `FAILED` or is gone, a new run starts with the new request, the old run moves to `history`, and the record takes the new checksum ([agreed here](apify/apify-sdk-js#759 (comment))). - The client of a named run is stored only after the run is started or reused. - The `run_name` docstrings describe the new rule. No action on [B4nan's comment](apify/apify-sdk-js#759 (comment)) about loading the child-run record lazily instead of in Actor init. JS kept the load in `init()`, because the synchronous `Actor.childRuns` getter needs the records, and Python already loads them the same way in `__aenter__`. The docs in #1160 still say a name is bound to its first input. That will be fixed there. *✍️ Drafted by Claude Code*
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Stacked on #1155.
Docs for the whole child runs stack, moved out of #1149, #1151, #1153, #1154 and #1155 so those PRs only carry code and tests. Adds sections on named child runs, the
Actor.child_runsproperty, aborting child runs with the parent, the concurrency limit and the shared charge budget to the "Interacting with other Actors" guide, each with a code sample.✍️ Drafted by Claude Code