Created an audit table to track application history (#647)

* create audit table for applications and create audit trigger for table insert

* Added application-status audit table and fuctions

Co-authored-by: britneyepps <bepps@codeforamerica.org>

src/main/resources/db/migration/V35__create-applications-audit-table.sql

@@ -0,0 +1,20 @@
+CREATE TABLE applications_audit
+(
+    op CHAR(1) NOT NULL,
+    op_at TIMESTAMP WITHOUT TIME ZONE NOT NULL,
+    op_by VARCHAR NOT NULL,
+    application_id VARCHAR NOT NULL,
+    completed_at TIMESTAMP WITHOUT TIME ZONE,
+    county VARCHAR NOT NULL DEFAULT 'OTHER',
+    time_to_complete INTEGER DEFAULT 0,
+    sentiment VARCHAR,
+    feedback TEXT,
+    flow VARCHAR,
+    application_data jsonb,
+    updated_at timestamp,
+    caf_application_status VARCHAR,
+    ccap_application_status VARCHAR,
+    uploaded_documents_status VARCHAR,
+    doc_upload_email_status VARCHAR,
+    certain_pops_application_status VARCHAR
+)

src/main/resources/db/migration/V36__add-triggers-for-applications-audit.sql

@@ -0,0 +1,22 @@
+create or replace function fn_applications_audit() returns trigger
+as
+$applications_audit$
+
+begin
+    if (TG_OP = 'DELETE') THEN
+        insert into applications_audit SELECT 'D', now(), user, OLD.*;
+    elsif (TG_OP = 'UPDATE') THEN
+        insert into applications_audit SELECT 'U', now(), user, NEW.*;
+    elsif (TG_OP = 'INSERT') THEN
+       insert into applications_audit SELECT 'I', now(), user, NEW.*;
+    end if;
+    return null;
+end;
+
+$applications_audit$
+    language plpgsql;
+
+create trigger tr_applications_audit_trigger
+    after insert or update or delete on applications
+    for each row
+execute procedure fn_applications_audit();

src/main/resources/db/migration/V37__create-applications-status-table.sql

@@ -0,0 +1,12 @@
+CREATE TABLE application_statuses_audit
+(
+    op CHAR(1) NOT NULL,
+    op_at TIMESTAMP WITHOUT TIME ZONE NOT NULL,
+    op_by VARCHAR NOT NULL,
+    application_id VARCHAR NOT NULL,
+    document_type VARCHAR NOT NULL,
+    routing_destination VARCHAR NOT NULL,
+    status VARCHAR NOT NULL,
+    created_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW()
+)

src/main/resources/db/migration/V38__add-triggers-for-application-statuses-audit.sql

@@ -0,0 +1,22 @@
+create or replace function fn_application_statuses_audit() returns trigger
+as
+$application_statuses_audit$
+
+begin
+    if (TG_OP = 'DELETE') THEN
+        insert into application_statuses_audit SELECT 'D', now(), user, OLD.*;
+    elsif (TG_OP = 'UPDATE') THEN
+        insert into application_statuses_audit SELECT 'U', now(), user, NEW.*;
+    elsif (TG_OP = 'INSERT') THEN
+        insert into application_statuses_audit SELECT 'I', now(), user, NEW.*;
+    end if;
+    return null;
+end;
+
+$application_statuses_audit$
+    language plpgsql;
+
+create trigger tr_application_statuses_audit_trigger
+    after insert or update or delete on application_status
+    for each row
+execute procedure fn_application_statuses_audit();