Add date details migrations

migrations/007.date-details.down.sql

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+-- Remove source details and links
+
+ALTER TABLE buildings DROP COLUMN IF EXISTS date_source_detail;
+ALTER TABLE buildings DROP COLUMN IF EXISTS date_link;

migrations/007.date-details.up.sql

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+--
+-- Source details and links
+--
+
+-- Create date source details
+ALTER TABLE buildings ADD COLUMN IF NOT EXISTS date_source_detail varchar;
+ALTER TABLE buildings ADD CONSTRAINT buildings_date_source_detail_len CHECK (length(date_source_detail) < 500);
+
+-- Create list of links
+ALTER TABLE buildings ADD COLUMN IF NOT EXISTS date_link text[];