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hub/docs/decisions/ADR-002-jsonb-nullability-rationale.md
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# ADR-002: JSONB nullability rationale
- **Status**: Accepted
- **Date**: 2026-04-19
- **Deciders**: alkdev
## Context
Some JSONB columns are NOT NULL (messages.data, parts.data, operations.inputSchema) while others are nullable (sessions.data, spokes.hostInfo, operations.outputSchema). Need a consistent rationale for when JSONB should be nullable.
## Decision
JSONB columns are NOT NULL when data is required for the record to be meaningful — a message without role-specific metadata or a part without type-specific content is incomplete. Nullable JSONB columns are for optional, evolving, or context-dependent data.
## Consequences
Minimal — this is a convention that matches the semantic meaning of each column. Positive: consistent mental model for schema design. Negative: none significant.