chore: filter syntax & schema

[alexluong]

Filter Syntax Guide Documentation Update

Summary

Updated the Filter Syntax Guide to accurately document all filterable event properties.

Changes

Event Structure

Previously, the guide only documented two top-level properties:

• data
• metadata

Updated to document all five filterable properties:

• id — The event ID
• topic — The event topic
• time — Event timestamp (RFC3339 format)
• metadata — Additional event information
• data — The event payload

New Examples

Added time range filtering example:

{
  "time": {
    "$gte": "2025-01-01T00:00:00Z",
    "$lt": "2025-02-01T00:00:00Z"
  }
}

Reference

The filter input structure is defined in internal/models/destination.go:161-167:

filterInput := map[string]any{
    "id":       event.ID,
    "topic":    event.Topic,
    "time":     event.Time.Format("2006-01-02T15:04:05Z07:00"),
    "metadata": map[string]any{},
    "data":     map[string]any{},
}

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