How to move all timestamptz dates on the postgresql database? - postgresql

Question

I have a postgresql dump of some seed database. This dump was created few months ago so all data is there are about the past. It is not very convenient to develop on the past data because I have to always scroll in UI to that past date.
I was thinking to automatically shift every timestamptz field in the database by specific offset. It sounds doable via some script which will go throw database schema, find every timestamptz field, and then build a SQL update for every field.
So, are there any ready-made solutions for this?

Answer 1

I solved it using this SQL query:
--
-- This SQL query shift all timestamptz fields in the database
--
--
BEGIN;
DO $$
declare
sql_query text;
table_row record;
column_row record;
trigger_row record;
BEGIN
FOR table_row IN (
SELECT table_schema, table_name
FROM information_schema.tables
WHERE table_type = 'BASE TABLE' AND table_schema = 'public'
) LOOP
sql_query := '';
RAISE NOTICE 'Checking %', table_row.table_name;
FOR column_row IN (
SELECT column_name
FROM information_schema.columns
WHERE
table_schema = table_row.table_schema
AND table_name = table_row.table_name
AND udt_name = 'timestamptz'
AND is_updatable = 'YES'
) LOOP
sql_query := sql_query ||
'"' || column_row.column_name || '" = "' || column_row.column_name || '" + interval ''100'' day,';
END LOOP;
IF sql_query != '' THEN
sql_query := substr(sql_query,1, length(sql_query)-1); -- Remove last ","
sql_query := 'UPDATE ' || table_row.table_schema || '.' || table_row.table_name || ' SET ' || sql_query || ';';
-- There might be some triggers which so let's disable them before update
FOR trigger_row IN (
SELECT trigger_name FROM information_schema.triggers WHERE
trigger_schema = table_row.table_schema
AND event_object_table = table_row.table_name
AND event_manipulation = 'UPDATE' and
(action_timing = 'BEFORE' or action_timing = 'AFTER')
) LOOP
sql_query := 'alter table ' || table_row.table_schema || '.' || table_row.table_name ||
' disable trigger ' || trigger_row.trigger_name || ';' ||
sql_query ||
'alter table ' || table_row.table_schema || '.' || table_row.table_name ||
' enable trigger ' || trigger_row.trigger_name || ';';
END LOOP;
-- Same for the row level security, disable it if it was enabled
IF (SELECT pg_class.oid FROM pg_class
LEFT JOIN pg_catalog.pg_namespace ON pg_catalog.pg_namespace.oid = pg_class.relnamespace
WHERE relname = table_row.table_name AND
pg_catalog.pg_namespace.nspname = table_row.table_schema AND relrowsecurity) IS NOT NULL THEN
sql_query := 'alter table ' || table_row.table_schema || '.' || table_row.table_name ||
' disable row level security;' ||
sql_query ||
'alter table ' || table_row.table_schema || '.' || table_row.table_name ||
' enable row level security;';
END IF;
RAISE NOTICE ' %', sql_query;
EXECUTE sql_query;
RAISE NOTICE '---------------------------';
END IF;
END LOOP;
END$$;
COMMIT;

Answer 2

Just add things to the database and then update it with this query, change the column name, table name and the amount of days you want it incremented by
UPDATE table_name
SET timestamptz = timestamptz + interval '1' day
WHERE 1 = 1;