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…#851) Template payload types (**APPLY** and **ROLLBACK**) are now required to implement the TemplatePayload interface, which provides a validate() method called at pipeline load time — before any change executes. Public API: - **TemplatePayload** interface with validate() returning validation errors - **TemplatePayloadValidationError** for field-level and general error reporting - **TemplateString** wrapper for String-based payloads (e.g. raw SQL) - **ChangeTemplate** and **AbstractChangeTemplate** now enforce **APPLY**/**ROLLBACK** extends TemplatePayload bounds Internal type alignment: - **AbstractTemplateLoadedChange**, **SimpleTemplateLoadedChange**, and **MultiStepTemplateLoadedChange** propagate **TemplatePayload** bounds,enabling direct validate() calls without instanceof checks or casts - **AbstractTemplateExecutableTask** and its subclasses propagate bounds, removing explicit (**TemplatePayload**) casts on **setApplyPayload**/**setRollbackPayload** - **TemplateLoadedTaskBuilder** remains the sole raw-type boundary where runtime reflection constructs the typed hierarchy - FileUtil extended with scalar-to-wrapper conversion for SnakeYAML deserialization of TemplateString from plain YAML strings
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Template payload types (APPLY and ROLLBACK) are now required to implement
the TemplatePayload interface, which provides a validate() method called
at pipeline load time — before any change executes.
Public API:
APPLY/ROLLBACK extends TemplatePayload bounds
Internal type alignment:
MultiStepTemplateLoadedChange propagate TemplatePayload bounds,
enabling direct validate() calls without instanceof checks or casts
removing explicit (TemplatePayload) casts on setApplyPayload/setRollbackPayload
runtime reflection constructs the typed hierarchy
deserialization of TemplateString from plain YAML strings