SignalR Reference: Control Hub

Control Hub: APIs for managing strategies, positions, and orders.

• Hub URL: /hubs/control/v2

All request/response methods return an API envelope (MesoLiveApiResponse<T>).

Envelope fields: MesoLiveApiResponse

2.0 breaking change

Prepared execution uses ExecPlanLegRef and ExecPlanLegId for order and paper-fill identity. LegGroupOrder.LegNames was replaced by LegGroupOrder.ExecPlanLegIds; ApplyPaperFillsArgs.PaperLegFills is now a list of PaperLegFill values.

GetIdempotencyRecord

Retrieve the idempotency record for a previously submitted idempotent operation.

Args model: GetIdempotencyRecordArgs

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Idempotency key used for an idempotent operation (e.g. SendOrder, ApplyPaperFills, CancelOrder).

Returns (payload): IdempotencyRecord

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Idempotency key used to de-duplicate requests and enable safe retries.
Operation	IdempotencyOperation	Yes	No		Operation type associated with this key.
Status	IdempotencyRecordStatus	Yes	No		Processing state for this operation.
CreatedAt	datetime	Yes	No		UTC timestamp when the record was created.
UpdatedAt	datetime	Yes	No		UTC timestamp when the record was last updated.
RequestHash	str	No	Yes		Optional hash of the original request payload (for diagnostics).
LiveExecPlanId	int	No	Yes		Optional live execution plan id associated with the operation (if applicable).
LiveOrderIds	list[int]	No	Yes		Optional live order ids created/affected by the operation (if applicable).
ErrorMessage	str	No	Yes		Error message for failed operations (if available).
JobId	str	No	Yes		Job id for asynchronous operations (if applicable).
JobStatus	PreparationStatus	No	Yes		Job status for asynchronous operations (if applicable).
JobResult	JsonElement	No	Yes		Raw job result payload for asynchronous operations (if applicable).
JobErrorMessage	str	No	Yes		Raw job error message for asynchronous operations (if applicable).
ResponseStatus	StatusCode	No	Yes		Response status code returned by the original API call (if captured).
ResponseMessage	str	No	Yes		Response message returned by the original API call (if captured).
ResponseError	MesoLiveApiError	No	Yes		Response error details returned by the original API call (if captured).
ResponseData	str	No	Yes		Raw response data returned by the original API call (if captured).

ListAgents

List currently connected agent instances (per provider/connector).

Args model: ListAgentsArgs

No fields.

Returns (payload): ListAgentsResult

Field	Type	Required	Nullable	Default	Description
Agents	list[AgentInfo]	Yes	No		Connected agents.

ListAccounts

List brokerage accounts linked to the authenticated user.

Args model: ListAccountsArgs

Field	Type	Required	Nullable	Default	Description
BrokerTypeFilter	BrokerType	No	Yes		Optional filter by broker type. null = all brokerages.
Limit	int	No	Yes		Maximum number of items to return. The server may cap this value.
ContinuationToken	str	No	Yes		Pagination token returned by a previous ListAccounts call.

Returns (payload): ListAccountsResult

Field	Type	Required	Nullable	Default	Description
Accounts	list[LiveAccount]	Yes	No		Accounts returned by this page.
ContinuationToken	str	No	Yes		Pagination token for the next page. null/empty when no more items are available.

GetAccount

Get a single brokerage account by broker account id.

Args model: GetAccountArgs

Field	Type	Required	Nullable	Default	Description
BrokerAccountId	str	No	No		Broker account id to retrieve.

Returns (payload): GetAccountResult

Field	Type	Required	Nullable	Default	Description
Account	LiveAccount	Yes	No		Account details.

CreateStrategy

Create a new live strategy from a Strategy Definition.

Args model: CreateStrategyArgs

Field	Type	Required	Nullable	Default	Description
Name	str	Yes	No		User-facing strategy name.
Description	str	Yes	No		User-facing strategy description.
BacktestId	str	Yes	No		Backtest identifier used for traceability (as produced by MesoSim tooling).
MesoSimInstance	str	Yes	No		MesoSim instance identifier where the strategy definition originated.
StrategyDefinition	dict[str, Any]	Yes	No		Strategy Definition payload.
ActiveOnAccounts	list[str]	Yes	No		Broker account ids where this strategy should be active/enabled.

Returns (payload): CreateStrategyResult

Field	Type	Required	Nullable	Default	Description
StrategyId	int	No	No		Live strategy id created by the server.

UpdateStrategy

Update an existing live strategy definition and its activation settings.

Args model: UpdateStrategyArgs

Field	Type	Required	Nullable	Default	Description
StrategyId	int	Yes	No		Live strategy id to update.
Description	str	No	Yes		Optional updated user-facing strategy description. When null, the existing description is preserved.
BacktestId	str	No	Yes		Optional updated backtest identifier used for traceability (as produced by MesoSim tooling). When null, the existing BacktestId is preserved. Must be provided together with MesoSimInstance when updating.
MesoSimInstance	str	No	Yes		Optional updated MesoSim instance identifier where the strategy definition originated. When null, the existing MesoSimInstance is preserved. Must be provided together with BacktestId when updating.
StrategyDefinition	dict[str, Any]	Yes	No		Updated strategy definition payload.
ActiveOnAccounts	list[str]	Yes	No		Broker account ids where this strategy should be active/enabled.

Returns (payload): UpdateStrategyResult

No fields.

RenameStrategy

Rename an existing live strategy.

Args model: RenameStrategyArgs

Field	Type	Required	Nullable	Default	Description
StrategyId	int	Yes	No		Live strategy id to rename.
Name	str	Yes	No		New user-facing strategy name.

Returns (payload): RenameStrategyResult

Field	Type	Required	Nullable	Default	Description
Success	bool	No	No		Whether the rename operation succeeded.

DeleteStrategy

Delete an existing live strategy.

Args model: DeleteStrategyArgs

Field	Type	Required	Nullable	Default	Description
StrategyId	int	Yes	No		Live strategy id to delete.

Returns (payload): DeleteStrategyResult

Field	Type	Required	Nullable	Default	Description
Success	bool	No	No		Whether the delete operation succeeded.

ListStrategies

List strategies accessible to the authenticated user.

Args model: ListStrategiesArgs

Field	Type	Required	Nullable	Default	Description
Limit	int	No	Yes		Maximum number of items to return. The server may cap this value.
ContinuationToken	str	No	Yes		Pagination token returned by a previous ListStrategies call.
ActiveOnAccounts	list[str]	No	Yes		Optional filter: only strategies active on any of these broker account ids.

Returns (payload): ListStrategiesResult

Field	Type	Required	Nullable	Default	Description
Strategies	list[LiveStrategy]	Yes	No		Strategies returned by this page.
ContinuationToken	str	No	Yes		Pagination token for the next page. null/empty when no more items are available.

GetStrategy

Get a single strategy by strategy id.

Args model: GetStrategyArgs

Field	Type	Required	Nullable	Default	Description
StrategyId	int	Yes	No		Live strategy id to retrieve.

Returns (payload): GetStrategyResult

Field	Type	Required	Nullable	Default	Description
Strategy	LiveStrategy	Yes	No		Strategy details.

ListPositions

List live positions.

Args model: ListPositionsArgs

Field	Type	Required	Nullable	Default	Description
Kind	LivePositionKindFilter	No	No	LivePositionKindFilter.StrategyOrExecutionPlan	Which position namespace to query.
LiveStrategyId	int	No	Yes		Optional filter by live strategy id.
LiveExecPlanId	int	No	Yes		Optional filter by live execution plan id.
BrokerAccountId	str	No	Yes		Optional filter by broker account id.
UnderlyingContractId	int	No	Yes		Optional filter by underlying live contract id.
State	LivePositionState	No	Yes		Optional filter by live position state.
Limit	int	No	Yes		Maximum number of items to return. The server may cap this value.
ContinuationToken	str	No	Yes		Pagination token returned by a previous ListPositions call.

Returns (payload): ListPositionsResult

Field	Type	Required	Nullable	Default	Description
Positions	list[LivePosition]	No	No		Positions returned by this page.
ContinuationToken	str	No	Yes		Pagination token for the next page. null/empty when no more items are available.

StartPreparePositionEntry

Start an asynchronous "prepare entry" job for entering a new position. Matches the Build Position functionality of the UI.

Args model: PreparePositionEntryArgs

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Client-provided idempotency key used to de-duplicate requests and enable safe retries.
PositionName	str	Yes	No		User-facing name for the new position to be created.
StrategyId	int	Yes	No		Live strategy id to enter.
BrokerAccountId	str	Yes	No		Target broker account id to enter the position on.
LegSelectionConstraint	LiveLegSelectionConstraint	Yes	No		Constraint for how option legs may be selected (uniqueness rules).
Underlying	LiveUnderlying	Yes	No		Underlying used as the basis for leg selection and quoting.
DataProvider	DataProviderType	Yes	Yes		Optional override for which market data provider to use. null = server default.

Returns (payload): StartPreparePositionEntryResult

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Job id identifying the asynchronous preparation.

GetPreparePositionEntryStatus

Get status and (if completed) the result of a "prepare entry" job.

Args model: GetPreparePositionEntryStatusArgs

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Job id returned by StartPreparePositionEntry.

Returns (payload): GetPreparePositionEntryStatusResult

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Preparation job id.
Status	PreparationStatus	Yes	No		Current preparation status.
Result	PreparePositionEntryResult	No	Yes		Completed preparation result; null until the job succeeds.
Error	str	No	Yes		Failure message when the job failed; otherwise null.
CreatedAt	datetime	Yes	No		UTC time when the job was created.
UpdatedAt	datetime	Yes	No		UTC time when the job was last updated.

CancelPreparePositionEntry

Cancel an in-progress "prepare entry" job.

Args model: CancelPreparePositionEntryArgs

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Client-provided idempotency key used to de-duplicate requests and enable safe retries.
JobId	str	Yes	No		Job id returned by StartPreparePositionEntry.

Returns (payload): CancelPreparePositionEntryResult

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Job id.
Cancelled	bool	Yes	No		Whether the job was cancelled.

StartPreparePositionExit

Start an asynchronous "prepare exit" job for exiting an existing position. Matches the Liquidate functionality of the UI.

Args model: PreparePositionExitArgs

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Client-provided idempotency key used to de-duplicate requests and enable safe retries.
PositionId	int	Yes	No		Live position id to exit.

Returns (payload): StartPreparePositionExitResult

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Job id identifying the asynchronous preparation.

GetPreparePositionExitStatus

Get status and (if completed) the result of a "prepare exit" job.

Args model: GetPreparePositionExitStatusArgs

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Job id returned by StartPreparePositionExit.

Returns (payload): GetPreparePositionExitStatusResult

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Preparation job id.
Status	PreparationStatus	Yes	No		Current preparation status.
Result	PreparePositionExitResult	No	Yes		Completed preparation result; null until the job succeeds.
Error	str	No	Yes		Failure message when the job failed; otherwise null.
CreatedAt	datetime	Yes	No		UTC time when the job was created.
UpdatedAt	datetime	Yes	No		UTC time when the job was last updated.

CancelPreparePositionExit

Cancel an in-progress "prepare exit" job.

Args model: CancelPreparePositionExitArgs

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Client-provided idempotency key used to de-duplicate requests and enable safe retries.
JobId	str	Yes	No		Job id returned by StartPreparePositionExit.

Returns (payload): CancelPreparePositionExitResult

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Job id.
Cancelled	bool	Yes	No		Whether the job was cancelled.

StartPreparePositionAdjustment

Start an asynchronous "prepare adjustment" job for adjusting an existing position.

Args model: PreparePositionAdjustmentArgs

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Client-provided idempotency key used to de-duplicate requests and enable safe retries.
PositionId	int	Yes	No		Live position id to adjust.
Operation	PositionAdjustmentOperation	Yes	No		Adjustment operation to prepare (e.g. remove/add legs, move a leg, or update vars).
Condition	str	Yes	No		Condition identifier or expression used by the server to select and validate the adjustment.
LegSelectionConstraint	LiveLegSelectionConstraint	No	Yes		Optional constraint for how option legs may be selected (uniqueness rules). null = server default.
TargetLiveLegIds	list[int]	No	Yes		Canonical live-leg ids to target for existing-leg operations. MoveLeg and RemoveLegs require one or more open live-leg ids. AddLegs and UpdateVars ignore this value.
DataProvider	DataProviderType	No	Yes		Optional override for which market data provider to use. null = server default.

Returns (payload): StartPreparePositionAdjustmentResult

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Job id identifying the asynchronous preparation.

GetPreparePositionAdjustmentStatus

Get status and (if completed) the result of a "prepare adjustment" job.

Args model: GetPreparePositionAdjustmentStatusArgs

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Job id returned by StartPreparePositionAdjustment.

Returns (payload): GetPreparePositionAdjustmentStatusResult

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Preparation job id.
Status	PreparationStatus	Yes	No		Current preparation status.
Result	PreparePositionAdjustmentResult	No	Yes		Completed preparation result; null until the job succeeds.
Error	str	No	Yes		Failure message when the job failed; otherwise null.
CreatedAt	datetime	Yes	No		UTC time when the job was created.
UpdatedAt	datetime	Yes	No		UTC time when the job was last updated.

CancelPreparePositionAdjustment

Cancel an in-progress "prepare adjustment" job.

Args model: CancelPreparePositionAdjustmentArgs

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Client-provided idempotency key used to de-duplicate requests and enable safe retries.
JobId	str	Yes	No		Job id returned by StartPreparePositionAdjustment.

Returns (payload): CancelPreparePositionAdjustmentResult

Field	Type	Required	Nullable	Default	Description
JobId	str	Yes	No		Job id.
Cancelled	bool	Yes	No		Whether the job was cancelled.

GetPosition

Get a detailed view of a single live position (legs, leg groups, vars, quotes/greeks).

Args model: GetPositionArgs

Field	Type	Required	Nullable	Default	Description
LivePositionId	int	No	No		Live position id to retrieve.

Returns (payload): GetPositionResult

Field	Type	Required	Nullable	Default	Description
Position	LivePosition	No	No		Position details.
Vars	dict[str, Decimal]	No	No		Current strategy/position variables (var name → value).
PositionStrategyDefinition	PositionStrategyDefinitionSnapshot	No	Yes		Position-specific strategy definition captured at entry time. Null for legacy/discretionary positions.
LegGreeks	dict[int, LiveGreeks]	No	No		Per-leg greeks keyed by live leg id.
LegPrices	dict[int, LivePrices]	No	No		Per-leg prices keyed by live leg id.
PositionLegs	dict[int, LiveLeg]	Yes	No		Position legs keyed by live leg id.
LegGroups	dict[int, list[int]]	Yes	No		Leg groups keyed by leg group id. Values are lists of live leg ids in that group.
LegGroupQtys	dict[int, PositionLegGroupQtys]	Yes	No		Per-leg-group quantities (group qty and per-leg quantities) keyed by leg group id.
LegGroupGreeks	dict[int, LiveGreeks]	No	No		Per-leg-group greeks keyed by leg group id.
LegGroupPrices	dict[int, LivePrices]	No	No		Per-leg-group prices keyed by leg group id.
PositionGreeks	LiveGreeks	No	No		Aggregated greeks for the position.
PositionPrice	LivePrices	No	No		Aggregated prices for the position.

ListLegs

List live legs.

Args model: ListLegsArgs

Field	Type	Required	Nullable	Default	Description
LivePositionId	int	No	Yes		Optional filter by live position id.
LiveStrategyId	int	No	Yes		Optional filter by live strategy id.
LiveExecPlanId	int	No	Yes		Optional filter by live execution plan id.
BrokerAccountId	str	No	Yes		Optional filter by broker account id.
IsOpen	bool	No	Yes		Optional filter by open/closed state. null = both open and closed.
Limit	int	No	Yes		Maximum number of items to return. The server may cap this value.
ContinuationToken	str	No	Yes		Pagination token returned by a previous ListLegs call.

Returns (payload): ListLegsResult

Field	Type	Required	Nullable	Default	Description
Legs	list[LiveLeg]	No	No	new()	Legs returned by this page.
ContinuationToken	str	No	Yes		Pagination token for the next page. null/empty when no more items are available.

GetLegs

Get multiple legs by leg id.

Args model: GetLegsArgs

Field	Type	Required	Nullable	Default	Description
LegIds	list[int]	Yes	No		Live leg ids to retrieve.

Returns (payload): GetLegsResult

Field	Type	Required	Nullable	Default	Description
Legs	dict[int, LiveLeg]	Yes	No		Legs keyed by live leg id.
LegGreeks	dict[int, LiveGreeks]	No	Yes		Optional greeks keyed by live leg id (if available).
LegPrices	dict[int, LivePrices]	No	Yes		Optional prices keyed by live leg id (if available).

GetLeg

Get a single leg by leg id.

Args model: GetLegArgs

Field	Type	Required	Nullable	Default	Description
LegId	int	No	No		Live leg id to retrieve.

Returns (payload): GetLegResult

Field	Type	Required	Nullable	Default	Description
Leg	LiveLeg	Yes	No		Leg details.
LegGreeks	LiveGreeks	No	Yes		Optional greeks snapshot for the leg (if available).
LegPrices	LivePrices	No	Yes		Optional prices snapshot for the leg (if available).

ApplyPaperFills

Apply fills to an execution plan on a paper account. Each fill identifies an execution-plan leg id. A signed quantity can partially fill the remaining planned quantity; when omitted, the remaining planned quantity is filled. All tradeable legs in a leg group that still have remaining quantity must be filled in matching ratios.

Args model: ApplyPaperFillsArgs

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Client-provided idempotency key used to de-duplicate requests and enable safe retries.
BrokerAccountId	str	Yes	No		Target paper broker account id to apply fills to.
ExecPlanId	int	Yes	No		Live execution plan id to apply paper fills for.
QtyMultiplier	Decimal	Yes	Yes		Quantity multiplier for AddPosition/AddLegs paper fills. Positive and required for entry/add-leg plans; it may override the prepared multiplier only before execution starts, then must match the locked multiplier. Must be null for exits, removals, and moves.
PaperLegFills	list[PaperLegFill]	Yes	No		Per-leg paper fills; each fill carries an explicit execution-plan leg id.

Returns (payload): ApplyPaperFillsResult

Field	Type	Required	Nullable	Default	Description
Success	bool	Yes	No		Whether the paper fills were applied successfully.

GetExecutionPlanFillState

Get fill progress for an execution plan prepared through Control Hub v2.

Args model: GetExecutionPlanFillStateArgs

Field	Type	Required	Nullable	Default	Description
ExecPlanId	int	Yes	No		Live execution plan id.

Returns (payload): GetExecutionPlanFillStateResult

Field	Type	Required	Nullable	Default	Description
ExecPlanId	int	Yes	No		Live execution plan id.
IsComplete	bool	Yes	No		True when all non-marker execution-plan legs are fully filled and every broker execution for the plan was attributed to an execution-plan leg.
Legs	list[ExecPlanLegFillState]	Yes	No		Per-leg fill progress.
Groups	list[LegGroupOrderState]	Yes	No		Per-group order and fill progress.

SendOrder

Submit an order for a real (non-paper) brokerage account. The submitted leg ids must exactly match the selected execution-plan leg group. Paper-trading accounts should use ApplyPaperFills for manual paper fills.

Args model: SendOrderArgs

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Client-provided idempotency key used to de-duplicate requests and enable safe retries.
ReplacesOrder	int	Yes	Yes		Existing live order id to replace; null submits a new order.
BrokerAccountId	str	Yes	No		Broker account id where the order should be submitted.
ExecPlanId	int	Yes	No		Live execution plan id produced by a preparation job.
QtyMultiplier	Decimal	Yes	Yes		Quantity multiplier for AddPosition/AddLegs orders. Positive and required for entry/add-leg plans; it may override the prepared multiplier only before execution starts, then must match the locked multiplier. Must be null for exits, removals, and moves.
LegGroupId	int	Yes	No		Execution-plan leg group id being ordered.
LegGroupOrder	LegGroupOrder	Yes	No		Order parameters and execution-plan leg ids for the selected leg group.

Returns (payload): SendOrderResult

Field	Type	Required	Nullable	Default	Description
LiveOrderId	int	No	Yes		Live order id created/updated by the server (if available).
OrderState	OrderState	No	Yes		Current order state (if available).
Rejection	OrderRejectionInfo	No	Yes		Rejection details when the order is rejected.

CancelOrder

Request cancellation of an existing live order.

Args model: CancelOrderArgs

Field	Type	Required	Nullable	Default	Description
IdempotencyKey	str	Yes	No		Client-provided idempotency key used to de-duplicate requests and enable safe retries.
LiveOrderId	int	Yes	No		Live order id to cancel.

Returns (payload): CancelOrderResult

Field	Type	Required	Nullable	Default	Description
LiveOrderId	int	Yes	No		Live order id that was cancelled (or cancellation was requested for).

GetOrder

Get a single order by order id.

Args model: GetOrderArgs

Field	Type	Required	Nullable	Default	Description
OrderId	int	Yes	No		Live order id to retrieve.

Returns (payload): GetOrderResult

Field	Type	Required	Nullable	Default	Description
Order	Order	Yes	No		Order details.

ListOrders

List orders for a given execution plan.

Args model: ListOrdersArgs

Field	Type	Required	Nullable	Default	Description
ExecPlanId	int	Yes	No		Live execution plan id to list orders for.
Limit	int	No	Yes		Maximum number of items to return. The server may cap this value.
ContinuationToken	str	No	Yes		Pagination token returned by a previous ListOrders call.

Returns (payload): ListOrdersResult

Field	Type	Required	Nullable	Default	Description
Orders	list[Order]	Yes	No		Orders returned by this page.
ContinuationToken	str	No	Yes		Pagination token for the next page. null/empty when no more items are available.

ListExecutions

List executions.

Args model: ListExecutionsArgs

Field	Type	Required	Nullable	Default	Description
LiveLegId	int	No	Yes		Optional filter by live leg id.
LivePositionId	int	No	Yes		Optional filter by live position id.
LiveStrategyId	int	No	Yes		Optional filter by live strategy id.
LiveExecPlanId	int	No	Yes		Optional filter by live execution plan id.
BrokerAccountId	str	No	Yes		Optional filter by broker account id.
Limit	int	No	Yes		Maximum number of items to return. The server may cap this value.
ContinuationToken	str	No	Yes		Pagination token returned by a previous ListExecutions call.

Returns (payload): ListExecutionsResult

Field	Type	Required	Nullable	Default	Description
Executions	list[LiveExecution]	Yes	No		Executions returned by this page.
ContinuationToken	str	No	Yes		Pagination token for the next page. null/empty when no more items are available.

GetExecution

Get a single execution by execution id.

Args model: GetExecutionArgs

Field	Type	Required	Nullable	Default	Description
ExecutionId	int	Yes	No		Live execution id to retrieve.

Returns (payload): GetExecutionResult

Field	Type	Required	Nullable	Default	Description
Execution	LiveExecution	Yes	No		Execution details.

GetExecutions

Get multiple executions by execution ids.

Args model: GetExecutionsArgs

Field	Type	Required	Nullable	Default	Description
ExecutionIds	list[int]	Yes	No		Live execution ids to retrieve.

Returns (payload): GetExecutionsResult

Field	Type	Required	Nullable	Default	Description
Executions	dict[int, LiveExecution]	Yes	No		Executions keyed by live execution id.