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| ## De-identification | ||
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| ViewDefinition columns can be annotated with de-identification methods to transform sensitive data during SQL generation. Supported methods include redact, cryptoHash, dateshift, encrypt, substitute, perturb, and custom PostgreSQL functions. |
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| # De-identification | |||
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| Aidbox supports per-column de-identification in ViewDefinitions via a FHIR extension. When a column has a de-identification extension, the SQL compiler wraps the column expression with a PostgreSQL function that transforms the value before it reaches the output. | |||
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| Install the package via FHIR package management and use these ViewDefinitions directly, or copy and customize them. Every cryptographic key parameter in the pre-built VDs is blank (`""`) — you must set real keys before using them for actual de-identification. | ||
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| ## Using the UI |
Collaborator
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screenshot would help here
aleksandrkislitsyn
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Apr 16, 2026
Contributor
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remove this summary.md file - obsolete
| @@ -8,6 +8,10 @@ description: Create flat SQL views from FHIR resources using ViewDefinitions for | |||
| **SQL on FHIR** engine is currently in **preview** | |||
Contributor
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lets remove this hint btw
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| ### birthDateSafeHarbor | ||
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| Intended **only for `Patient.birthDate`**. Behaves like `dateshift` but returns NULL when the birth date implies the patient is over 89 years old, per HIPAA Safe Harbor rule 45 CFR 164.514(b)(2)(i)(C). |
Contributor
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Can we add a link here?
I think this one: https://www.ecfr.gov/current/title-45/subtitle-A/subchapter-C/part-164/subpart-E/section-164.514
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| Applying this method to any other date column is semantically incorrect — the function computes `age(current_date, input)` and treats the input as a birth date. Use plain `dateshift` for non-birth-date fields. | ||
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| Because the function depends on `current_date`, it is marked `STABLE` rather than `IMMUTABLE`. The age cutoff re-evaluates on every query. |
Contributor
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STABLE rather than IMMUTABLE
it might be a bit unclear to a reader at this point what does this mean - a link might be usefull, and also some short explanations
| | rangeType | code | no | `fixed` (absolute noise) or `proportional` (relative to value). Default: `fixed` | | ||
| | roundTo | integer | no | Decimal places to round to. 0 means integer. Default: 0 | | ||
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| With `fixed` range type, noise is in the range ±span/2. With `proportional`, noise is ±(span × value)/2. Any other `rangeType` value raises a SQL error. |
Contributor
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±span/2 and ±(span × value)/2 don't look great
probably mark it with ``
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