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
···
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-- This column stores the older of publishedAt (from JSON data) or indexed_at
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-- Used for sorting feeds chronologically by when content was actually published
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-- Note: We use ::timestamp AT TIME ZONE 'UTC' to make the expression immutable
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-- (direct ::timestamptz cast is not immutable as it depends on session timezone)
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ALTER TABLE documents
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ADD COLUMN sort_date timestamptz GENERATED ALWAYS AS (
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LEAST(
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-
COALESCE((data->>'publishedAt')::timestamp AT TIME ZONE 'UTC', indexed_at),
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indexed_at
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)
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) STORED;
···
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-- This column stores the older of publishedAt (from JSON data) or indexed_at
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-- Used for sorting feeds chronologically by when content was actually published
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-- Create an immutable function to parse ISO 8601 timestamps from text
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-- This is needed because direct ::timestamp cast is not immutable (accepts 'now', 'today', etc.)
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-- The regex validates the format before casting to ensure immutability
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CREATE OR REPLACE FUNCTION parse_iso_timestamp(text) RETURNS timestamptz
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LANGUAGE sql IMMUTABLE STRICT AS $$
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SELECT CASE
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-- Match ISO 8601 format: YYYY-MM-DDTHH:MM:SS with optional fractional seconds and Z/timezone
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WHEN $1 ~ '^\d{4}-\d{2}-\d{2}[T ]\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[+-]\d{2}:?\d{2})?$' THEN
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$1::timestamptz
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ELSE
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NULL
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END
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$$;
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ALTER TABLE documents
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ADD COLUMN sort_date timestamptz GENERATED ALWAYS AS (
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LEAST(
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COALESCE(parse_iso_timestamp(data->>'publishedAt'), indexed_at),
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indexed_at
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)
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) STORED;