VbzCart/tables/stk history

About

• Purpose: log of all stock movement
• Refers to: qryStock_containers, cat_items
• Rules:
  • Stock items must always be moved to or from a stock line. (The source/destination can be either another stock line or a line from a package or received restock.)
  • The sign of QtyAdded indicates whether the movement was to or from.

Fields

• CH_OthType: appropriate type code -- see qryStock_containers for codes
• IDS_OthCont: type code plus separator (period) plus ID unique to that type
• ID_Event: where known, this is the ID of the corresponding event in event_log
  • This is a sort of first step towards making this log part of the unified event log.
• WhoSystem: is optional and possibly redundant, but seems to be useful for marking imported/migrated records.

Future:

• Rename QtyBefore and QtyAfter to QtyLineBefore and QtyLineAfter.

History

• 2008-12-26 Changed field names, added new fields:
  • QtyFound → QtyBefore – quantity in this stock line before moving
  • QtyDone → QtyAdded – quantity added to this stock line
  • QtyLeft → QtyAfter – quantity in this stock line after moving
  • + QtyTotBefore – total of item in this bin before move)
  • + QtyTotAfter – total of item in this bin after move)
• 2008-12-27 More field name changes, to show grouping of local ("stock") and external ("other") locations:
  • ID_Stock → ID_StkLine
  • ID_Bin → ID_StkBin
  • ID_Cont → ID_OthCont
  • ID_Line → ID_OthLine
• 2008-12-29 Final revisions to match what I ended up with in Access for the migration:
  • +CH_OthType
  • +ID_OthCont
  • Created stk_history_legacy to handle legacy data properly; turned on all NOT NULLs
• 2009-12-20 Added fields WhoAdmin, WhoSystem, WhoNetwork
• 2009-12-22 Renamed When -> WhenStarted; added WhenFinished; QtyAfter and QtyBinAfter can now be NULL so we can record them when the event is complete.
• 2010-12-01 Added ID_Event field -- working towards including this in unified event logging
• 2014-05-26 Made fields DEFAULT NULL instead of NOT NULL so we don't have to know all of them before the event is started: ID_StkLine, ID_OthCont, ID_OthLine, IDS_OthCont
  • Left these as NOT NULL: ID_StkBin, CH_OthType -- Bins must be explicitly created by an administrator, and we should always know what type of container the Other is.
• 2014-06-26 Lengthened What from 63 chars to 255 because descriptions were being cut off.
• 2016-02-24 Apparently I never changed the actual DB; this time, lengthened What from 63 chars to TEXT.
• 2016-03-03
  • No NULL values found in ID_StkLine (or in legacy data), so changing it to NOT NULL.
  • Setting additional NOT NULL fields to DEFAULT NULL in order to accommodate stk_history_legacy data: QtyBefore, QtyBinBefore
    • I decided it was better to tolerate incomplete event-record data than to risk losing the record altogether when an event-write attempt doesn't include all the required fields, since there's currently no guarantee that a failed write will generate an alert anywhere.
  • Officially changing engine to INNODB. Migrated data from stk_history_legacy and then (what is now) `stk_history OLD 2`.

Notes

• The IDS_Line* fields are somewhat redundant, but I decided that redundancy was a goal: one of the purposes of history data (including stk_history) is to help reconstruct what happened when something goes wrong. Maintenance of the _stk_containers table is also somewhat redundant, but should make displaying meaningful history reports quicker (i.e. it's basically a sort of cache, as are all the _* tables).

SQL

CREATE TABLE `stk_history` (
  `ID`           INT              NOT NULL AUTO_INCREMENT,
  `ID_Event`     INT          DEFAULT NULL COMMENT "ID of corresponding event in unified log",
  `ID_StkBin`    INT              NOT NULL COMMENT "stock item is being moved to or from this bin",
  `ID_StkLine`   INT              NOT NULL COMMENT "stk_items.ID of item in this bin being moved",
  `CH_OthType`   CHAR             NOT NULL COMMENT "type for 'other' container & line",
  `ID_OthCont`   INT          DEFAULT NULL COMMENT "[container type's table].ID of the Other place",
  `ID_OthLine`   INT          DEFAULT NULL COMMENT "[container type's line table].ID of of the Other place",
  `IDS_OthCont`  VARCHAR(31)  DEFAULT NULL COMMENT "container.IDS of the Other place",
  `ID_Item`      INT              NOT NULL COMMENT "cat_items.ID of item being moved",
  `QtyBefore`    INT          DEFAULT NULL COMMENT "quantity found in this stock line before the move",
  `QtyAdded`     INT              NOT NULL COMMENT "quantity moved (Qty fields at targ/dest may change value later)",
  `QtyAfter`     INT          DEFAULT NULL COMMENT "quantity remaining in this stock line after the move",
  `QtyBinBefore` INT          DEFAULT NULL COMMENT "quantity of this ID_Item in the current bin before the move",
  `QtyBinAfter`  INT          DEFAULT NULL COMMENT "quantity of this ID_Item in the current bin after the move",
  `WhenStarted`  DATETIME         NOT NULL COMMENT "when the move was started",
  `WhenFinished` DATETIME     DEFAULT NULL COMMENT "when the move was completed",
  `What`         TEXT         DEFAULT NULL COMMENT "automatic, succinct description of operation",
  `WhoAdmin`     VARCHAR(127)     NOT NULL COMMENT "VbzCart admin username",
  `WhoSystem`    VARCHAR(127) DEFAULT NULL COMMENT "who logged into the operating system, if using non-web client app",
  `WhoNetwork`   VARCHAR(64)      NOT NULL COMMENT "network name or IP address of client machine",
  `Notes`        TINYTEXT             COMMENT "optional human-added explanatory notes",
  PRIMARY KEY(`ID`)
) ENGINE = INNODB;

Migration

The following was used to migrate records from what is now "stk_history OLD 2":

INSERT INTO stk_history_new (
  ID_Event,
  ID_StkBin,
  ID_StkLine,
  CH_OthType,
  ID_OthCont,
  ID_OthLine,
  IDS_OthCont,
  ID_Item,
  QtyBefore,
  QtyAdded,
  QtyAfter,
  QtyBinBefore,
  QtyBinAfter,
  WhenStarted,
  WhenFinished,
  What,
  WhoAdmin,
  WhoSystem,
  WhoNetwork,
  Notes
  )
SELECT
  ID_Event,
  ID_StkBin,
  ID_StkLine,
  CH_OthType,
  ID_OthCont,
  ID_OthLine,
  IDS_OthCont,
  ID_Item,
  QtyBefore,
  QtyAdded,
  QtyAfter,
  QtyBinBefore,
  QtyBinAfter,
  WhenStarted,
  WhenFinished,
  What,
  WhoAdmin,
  'from old stk_history',
  WhoNetwork,
  Notes
FROM stk_history

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