fix: moving mpe_tables

docs/tables/mpe_tables.md

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+---
+layout: article
+title: MPE_TABLES
+description: The MPE_TABLES table defines the tables that are EDITABLE within Data Controller for SAS® - along with attributes such as load type, number of approvals, and hook scripts.
+---
+
+# MPE_DATASTATUS_TABS
+
+The `MPE_TABLES` table defines the tables that are EDITABLE - along with attributes such as load type, number of approvals, and hook scripts.
+
+A more detailed breakdown of the columns / features is available in the [configuration](/dcc-tables/) section.
+
+## 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
+ - `NUM_OF_APPROVALS_REQUIRED num`: The number of approvals required (against staged data) before the base table is updated.
+ - `LOADTYPE char(12)`: The update method.  See [config](/dcc-tables/#loadtype)
+ - `BUSKEY char(1000)`: The logical key.  See [config](/dcc-tables/#buskey)
+ - `VAR_TXFROM char(32)`: The SCD2 start column of the base table.  See [config](/dcc-tables/#var_txfrom-var_txto)
+ - `VAR_TXTO char(32)`: The SCD2 end column of the base table.  See [config](/dcc-tables/#var_txfrom-var_txto)
+ - `VAR_BUSFROM char(32)`: The bitemporal business start column of the base table.  See [config](/dcc-tables/#var_busfrom-var_busto)
+ - `VAR_BUSTO char(32)`: The bitemporal business end column of the base table.  See [config](/dcc-tables/#var_busfrom-var_busto)
+ - `VAR_PROCESSED char(32)`: A column to contain the batch load time.  See [config](/dcc-tables/#var_processed)
+ - `CLOSE_VARS char(500)`: Close out _unloaded_ records for a key section.  See [config](/dcc-tables/#close_vars)
+ - `PRE_EDIT_HOOK char(200)`: Run SAS code before an EDIT.  See [config](/dcc-tables/#pre_edit_hook)
+ - `POST_EDIT_HOOK char(200)`: Run SAS code after an EDIT.  See [config](/dcc-tables/#post_edit_hook)
+ - `PRE_APPROVE_HOOK char(200)`: Run SAS code before an APPROVE.  See [config](/dcc-tables/#pre_approve_hook)
+ - `POST_APPROVE_HOOK char(200)`: Run SAS code after final approval (and dataload).  See [config](/dcc-tables/#post_approve_hook)
+ - `SIGNOFF_COLS char(200)`: For marking final approval.  See [config](/dcc-tables/#signoff_cols)
+ - `SIGNOFF_HOOK char(200)`: Run SAS code after signoff.  See [config](/dcc-tables/#signoff_hook)
+ - `NOTES char(1000)`: Additional notes. See [config](/dcc-tables/#notes)
+ - `RK_UNDERLYING char(1000)`: The key on which the retained key is generated. See [config](/dcc-tables/#rk_underlying)
+ - `HELPFUL_LINK char(300)`: URL to additional notes about the table. See [config](/dcc-tables/#helpful_link)