feat: validations

docs/dcc-validations.md

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+# Data Controller for SAS® - DQ Validations
+
+## Overview
+Quality in, Quality out!  Data Controller lets you enforce quality checks at the point of data entry, both directly via the web interface and also via Excel uploads.
+
+## Default Checks
+By default, the following frontend rules are always applied:
+
+* Length checking per target table variable lengths
+* Type checking per target table datatypes
+* Not Null check per target table constraints
+* Primary Key checking per business key defined in MPE_TABLES
+
+It is possible to configure a number of other rules by updating the MPE_VALIDATIONS table.  Simply set the `BASE_LIB`, `BASE_DS` and `BASE_COL` values, and ensure `RULE_ACTIVE=1` for it to be applied.
+
+## Configurable Checks
+
+Check back frequently as we plan to keep growing this list of checks.
+
+|RULE_TYPE|RULE_VALUE|DESCRIPTION|
+|---|---|---|
+|CASE|UPCASE|Will enforce uppercase of cell values.  Valid values: UPCASE, LOWCASE|
+|NOTNULL||Will prevent submission if null values are present|
+|MINVAL|1|Defines a minimum value for a numeric cell|
+|HARDSELECT|sashelp.class.name|A distinct list of values (max 1000) are taken from this library.member.column reference, and the value **must** be in this list|
+|SOFTSELECT|LIB.DS.COL|A distinct list of values (max 1000) are taken from this library.member.column reference, and the value **may** be in this list|