Expand documentation on grouping events without aggregate id#4059
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Rewrites and expands the section on handling events that lack the aggregate id in multi-stream projections. Introduces three practical patterns: using an inline lookup projection, storing linked ids on the projected document, and emitting derived events with the group key. Each pattern includes code examples and guidance on when to use them, providing clearer strategies for grouping events in Marten projections.
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Rewrites and expands the section on handling events that lack the aggregate id in multi-stream projections. Introduces three practical patterns: using an inline lookup projection, storing linked ids on the projected document, and emitting derived events with the group key. Each pattern includes code examples and guidance on when to use them, providing clearer strategies for grouping events in Marten projections.