feat: mpe_submit docs

docs/tables/mpe_datacatalog_vars.md

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+---
+layout: article
+title: MPE_DATACATALOG_VARS
+description: The MPE_DATACATALOG_VARS table catalogs variable attributes such as primary key status, not null constraints and index usage.
+---
+
+# MPE_DATACATALOG_VARS
+
+The `MPE_DATACATALOG_VARS` table catalogs variable attributes such as primary key status, not null constraints and index usage.
+
+To trigger a scan, see the Refresh Data Catalog [instructions](https://docs.datacontroller.io/admin-services/#refresh-data-catalog).
+
+## Columns
+
+ - `TX_FROM num`: SCD2 open datetime 
+ - 🔑 `TX_TO num`: SCD2 close datetime
+ - 🔑 `LIBREF char(8)`: SAS Libref (8 chars)
+ - 🔑 `DSN char(64)`: The library member name
+ - 🔑 `NAME char(64)`: The variable name
+ - `MEMTYPE char(8)`: The member type
+ - `TYPE char(16)`: The column type
+ - `LENGTH num`: The column length
+ - `VARNUM num`: The column position in the table
+ - `LABEL char(256)`: The column label
+ - `FORMAT char(49)`: The SAS format associated with the column
+ - `IDXUSAGE char(9)`: The column index type
+ - `NOTNULL char(3)`: The NOT NULL status
+ - `PK_IND num`: A flag to say whether the column is part of the primary key (1=PK, 0=Not PK).  A Primary key column is identified by being in a constraint (or index) that is both UNIQUE and NOT NULL.
+
+
+