feat: Custom fields — JSONB with schema per entity (PRD §5.5)
Models: CustomFieldDef (schema definitions) + CustomFieldValue (entity values)
- Per entity type: company, person, deal, project, invoice, ticket, contract
- Field types: string, number, boolean, date, select, multiselect
- Options for select/multiselect stored as JSON
- Unique constraint: (entityType, key) for definitions, (entityType, entityId, fieldDefId) for values
API /api/aos/custom-fields:
- GET: list all definitions (+ filter by entityType)
- POST: create definition (Zod validated, lowercase_snake_case key, unique check)
- PATCH: set value on entity (upsert pattern)
Seed: 10 field definitions across 6 entity types
- company: branche, mitarbeiterzahl, umsatzklasse
- person: entscheider, kontaktweg
- deal: wettbewerber, entscheidungsgrund
- project: prioritaet
- invoice: kostenstelle
- ticket: auswirkung
Verified: 10 defs, 3 company fields, duplicate→409, invalid key→400
Z User
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