a tool for shared writing and social publishing
leaflet.pub
add function to get immutable timestamp
awarm.space
+15
-3
supabase/migrations/20260125000000_add_sort_date_column.sql
+15
-3
supabase/migrations/20260125000000_add_sort_date_column.sql
···
2
2
-- This column stores the older of publishedAt (from JSON data) or indexed_at
3
3
-- Used for sorting feeds chronologically by when content was actually published
4
4
5
-
-- Note: We use ::timestamp AT TIME ZONE 'UTC' to make the expression immutable
6
-
-- (direct ::timestamptz cast is not immutable as it depends on session timezone)
5
+
-- Create an immutable function to parse ISO 8601 timestamps from text
6
+
-- This is needed because direct ::timestamp cast is not immutable (accepts 'now', 'today', etc.)
7
+
-- The regex validates the format before casting to ensure immutability
8
+
CREATE OR REPLACE FUNCTION parse_iso_timestamp(text) RETURNS timestamptz
9
+
LANGUAGE sql IMMUTABLE STRICT AS $$
10
+
SELECT CASE
11
+
-- Match ISO 8601 format: YYYY-MM-DDTHH:MM:SS with optional fractional seconds and Z/timezone
12
+
WHEN $1 ~ '^\d{4}-\d{2}-\d{2}[T ]\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[+-]\d{2}:?\d{2})?$' THEN
13
+
$1::timestamptz
14
+
ELSE
15
+
NULL
16
+
END
17
+
$$;
18
+
7
19
ALTER TABLE documents
8
20
ADD COLUMN sort_date timestamptz GENERATED ALWAYS AS (
9
21
LEAST(
10
-
COALESCE((data->>'publishedAt')::timestamp AT TIME ZONE 'UTC', indexed_at),
22
+
COALESCE(parse_iso_timestamp(data->>'publishedAt'), indexed_at),
11
23
indexed_at
12
24
)
13
25
) STORED;