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Add Forecast.actual column

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Alexander Hess 2021-01-31 18:29:53 +01:00
commit a5b590b24c
Signed by: alexander
GPG key ID: 344EA5AB10D868E0
3 changed files with 58 additions and 0 deletions
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src/urban_meal_delivery/db/forecasts.py
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@ -22,6 +22,10 @@ class Forecast(meta.Base):
time_step = sa.Column(sa.SmallInteger, nullable=False)
training_horizon = sa.Column(sa.SmallInteger, nullable=False)
model = sa.Column(sa.Unicode(length=20), nullable=False)
# We also store the actual order counts for convenient retrieval.
# A `UniqueConstraint` below ensures that redundant values that
# are to be expected are consistend across rows.
actual = sa.Column(sa.SmallInteger, nullable=False)
# Raw `.prediction`s are stored as `float`s (possibly negative).
# The rounding is then done on the fly if required.
prediction = sa.Column(postgresql.DOUBLE_PRECISION, nullable=False)
@ -62,6 +66,7 @@ class Forecast(meta.Base):
sa.CheckConstraint(
'training_horizon > 0', name='training_horizon_must_be_positive',
),
sa.CheckConstraint('actual >= 0', name='actuals_must_be_non_negative'),
sa.CheckConstraint(
"""
NOT (