docs consolidation
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| Concern | Decision | Notes |
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| Engine | PostgreSQL 14+ with UTF-8, `jsonb`, and partitioning support | Aligns with shared data plane; deterministic ordering enforced via primary keys. |
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| Engine | PostgreSQL 16+ with UTF-8, `jsonb`, and partitioning support | Aligns with shared data plane; deterministic ordering enforced via primary keys. |
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| Tenancy | Range/list partition on `tenant_id` for ledger + projection tables | Simplifies retention and cross-tenant anchoring. |
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| Time zone | All timestamps stored as `timestamptz` UTC | Canonical JSON uses ISO-8601 (`yyyy-MM-ddTHH:mm:ss.fffZ`). |
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| Hashing | SHA-256 (lower-case hex) over canonical JSON | Implemented client-side and verified by DB constraint. |
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