feat: mpe_submit docs

docs/tables/mpe_datacatalog_tabs.md

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+---
+layout: article
+title: MPE_DATACATALOG_TABS
+description: The MPE_DATACATALOG_TABS table catalogs attributes such as number of variables, compression status, and primary key fields.
+---
+
+# MPE_DATACATALOG_TABS
+
+The `MPE_DATACATALOG_TABS` table catalogs attributes such as number of variables, compression status, and primary key fields.
+
+More frequently changing attributes (such as size modification date and number of observations) are stored in [MPE_DATASTATUS_TABS](/mpe_datastatus_tabs).
+
+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
+ - `MEMTYPE char(8)`: The member type
+ - `DBMS_MEMTYPE char(32)`: The DBMS Member Type
+ - `MEMLABEL char(512)`: The Data Set Label
+ - `TYPEMEM char(8)`: The Data Set Type
+ - `NVAR num`: The number of variables
+ - `COMPRESS char(8)`: The compression routine
+ - `PK_FIELDS char(512)`: The list of primary key fields.  These are deduced from the table constraints.  A Primary key column is identified by being in a constraint (or index) that is both UNIQUE and NOT NULL.
+