= i2b2 LCBRU Customisations

Tags: [[i2b2]]

== 1. Remove primary key from Observation Fact table in Data database

=== Rationale

The primary key creates a unique constraint on Encounter_Num, Concept_Cd, Provider_Id, Start_Date & Modifier_Code.  However, we have genuine data that is duplicated on these fields.  For example, a repeat test on the same sample where the first was inconclusive.

=== Applied To

The customisation has been applied to the following i2b2 instances:

* i2b2_b1_data

=== Customisation

To apply the customisation, run the following SQL in the i2b2 data database:

{{{
#!sql
ALTER TABLE [dbo].[Observation_Fact] DROP CONSTRAINT [OBSERVATION_FACT_PK]
GO
}}}

=== Roll Back

To roll back the customisation, run the following SQL in the i2b2 data database:

{{{
#!sql
ALTER TABLE [dbo].[Observation_Fact] ADD  CONSTRAINT [OBSERVATION_FACT_PK] PRIMARY KEY NONCLUSTERED 
(
	[Encounter_Num] ASC,
	[Concept_Cd] ASC,
	[Provider_Id] ASC,
	[Start_Date] ASC,
	[Modifier_Cd] ASC
)
GO
}}}

== 2. New versions of data load stored procedures

=== Rationale

The procedures that come with i2b2 are broken, but are used by the i2b2 mapped importer.  Ideally I will write the process into the mapped importer.

The procedures are named the same as the original i2b2 stored procedures, but with the suffix `_LCBRU`.

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