Add custom metadata to Nylas objects for filtering

Short summary

Tutorial on attaching custom key-value metadata to Nylas objects (messages, drafts, events, calendars) to avoid maintaining a side mapping table. Only five keys (key1–key5) are indexed and filterable, so queryable data must go there while the remaining 45 pairs carry descriptive context. Includes curl and CLI examples for tagging sends and filtering by metadata later.

• •Attach up to 50 key-value metadata pairs to Nylas objects; only key1–key5 are filterable
• •Design tagging schema up front: put searchable values in indexed keys, descriptive data elsewhere
• •Tag every send in a campaign or untagged messages become invisible to filters

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