Thank you for the input.
I have come up with the following solution:
CREATE TABLE data_raw ( raw_data TEXT
);
COPY data_raw FROM 'C:\path\data_x.txt' ...; -- Repeated for each file
ALTER TABLE data_raw ADD COLUMN pk_id serial, ADD COLUMN id integer, ADD COLUMN indicator integer;
UPDATE data_raw SET indicator = CAST(substr(raw_data, 1, 1) AS integer), raw_data = substr(raw_data, 2);
CREATE TABLE id_base AS
SELECT pk_id, sum(CASE WHEN indicator = 1 THEN 1 ELSE 0 END) OVER (ORDER BY pk_id) AS
rec_id
FROM data_raw;
CREATE INDEX id_base_pk ON id_base USING btree(pk_id);
UPDATE data_raw r SET id = (SELECT rec_id FROM id_base b WHERE b.pk_id = r.pk_id);
DROP TABLE id_base;
--
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