Add official DOL and EIA economic calendar feeds

Collect weekly claims and precise commercial petroleum inventory changes with official schedule exceptions, distinct reporting periods, raw evidence, and revisions.

Extend explicit history backfills without changing their default source scope. Report archive gaps and reject mismatched weeks instead of filling current values into history.

backend/tests/fixtures/calendar/dol-2025-01-08.txt

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+News Release
+Connect with DOL at
+https://blog.dol.gov
+
+
+
+TRANSMISSION OF MATERIALS IN THIS RELEASE IS EMBARGOED UNTIL
+8:30 A.M. (Eastern) Wednesday, January 8, 2025
+
+UNEMPLOYMENT INSURANCE WEEKLY CLAIMS
+SEASONALLY ADJUSTED DATA
+In the week ending January 4, the advance figure for seasonally adjusted initial claims was 201,000, a decrease of
+10,000 from the previous week's unrevised level of 211,000. The 4-week moving average was 213,000, a decrease of
+10,250 from the previous week's unrevised average of 223,250.
+The advance seasonally adjusted insured unemployment rate was 1.2 percent for the week ending December 28,
+unchanged from the previous week's unrevised rate. The advance number for seasonally adjusted insured
+unemployment during the week ending December 28 was 1,867,000, an increase of 33,000 from the previous week's
+revised level. The previous week's level was revised down by 10,000 from 1,844,000 to 1,834,000. The 4-week moving
+average was 1,865,500, a decrease of 3,000 from the previous week's revised average. The previous week's average was
+revised down by 2,250 from 1,870,750 to 1,868,500.
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+UNADJUSTED DATA
+The advance number of actual initial claims under state programs, unadjusted, totaled 304,741 in the week ending
+January 4, an increase of 21,253 (or 7.5 percent) from the previous week. The seasonal factors had expected an increase
+of 35,647 (or 12.6 percent) from the previous week. There were 318,906 initial claims in the comparable week in 2024.
+The advance unadjusted insured unemployment rate was 1.4 percent during the week ending December 28, an increase of
+0.2 percentage point from the prior week. The advance unadjusted level of insured unemployment in state programs
+totaled 2,175,478, an increase of 316,122 (or 17.0 percent) from the preceding week. The seasonal factors had expected
+an increase of 276,886 (or 14.9 percent) from the previous week. A year earlier the rate was 1.4 percent and the volume
+was 2,104,272.
+
+
+The total number of continued weeks claimed for benefits in all programs for the week ending December 21 was
+1,886,283, a decrease of 88,519 from the previous week. There were 1,927,770 weekly claims filed for benefits in all
+programs in the comparable week in 2023.
+No state was triggered "on" the Extended Benefits program during the week ending December 21.
+Initial claims for UI benefits filed by former Federal civilian employees totaled 340 in the week ending December 28, a
+decrease of 166 from the prior week. There were 201 initial claims filed by newly discharged veterans, a decrease of 113
+from the preceding week.