The SEC data your backtest actually needs.

from valuein_sdk import ValueinClient, ValueinError

try:
    with ValueinClient() as client:

        # PIT: what did the market know on 2020-01-01?
        # Any restatement filed after that date is invisible.
        df = client.query("""
            SELECT fa.fiscal_year,
                   round(fa.numeric_value / 1e9, 2) AS revenue_bn,
                   fa.knowledge_at      -- SEC acceptance timestamp
            FROM fact fa
            JOIN filing   f ON fa.accession_id = f.accession_id
            JOIN security s ON f.entity_id     = s.entity_id
            WHERE s.symbol            = 'AAPL'
              AND f.form_type         = '10-K'
              AND fa.standard_concept = 'TotalRevenue'
              AND fa.knowledge_at    <= '2020-01-01'
            ORDER BY fa.fiscal_year DESC
        """)

except ValueinError as e:
    print(f"Error: {e}")

# fiscal_year  revenue_bn  knowledge_at
#        2019      260.17  2019-10-31T22:01Z  ← last visible
#        2018      265.60  2018-11-05T06:01Z
# FY2020 10-K wasn't filed until Oct 2020 — invisible