96 lines
4.2 KiB
Python
96 lines
4.2 KiB
Python
"""add generic commodity-scoped meter cost periods
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Revision ID: 20260822_19_meter_cost_periods
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Revises: 20260822_18_contract_scopes
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Create Date: 2026-08-22 00:00:00.000000
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This additive migration creates a separate audit ledger for non-electricity
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meter costs. It deliberately does not alter, migrate, or delete rows from the
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existing electricity-only energy_cost_period table.
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"""
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from typing import Sequence, Union
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import sqlalchemy as sa
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from alembic import op
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revision: str = "20260822_19_meter_cost_periods"
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down_revision: Union[str, None] = "20260822_18_contract_scopes"
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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class ExactDecimal(sa.TypeDecorator):
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"""Use SQLite text storage while retaining Numeric semantics elsewhere."""
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impl = sa.Numeric
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cache_ok = True
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def __init__(self, precision: int, scale: int) -> None:
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self.precision = precision
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self.scale = scale
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super().__init__(precision=precision, scale=scale)
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def load_dialect_impl(self, dialect):
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if dialect.name == "sqlite":
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return dialect.type_descriptor(sa.String(self.precision + 2))
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return dialect.type_descriptor(sa.Numeric(self.precision, self.scale, asdecimal=True))
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def upgrade() -> None:
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op.create_table(
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"meter_cost_period",
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sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
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sa.Column("commodity", sa.String(length=32), nullable=False),
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sa.Column("period_start", sa.DateTime(timezone=True), nullable=False),
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sa.Column("period_end", sa.DateTime(timezone=True), nullable=False),
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sa.Column("meter_id", sa.Integer(), nullable=True),
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sa.Column("source_binding_id", sa.Integer(), nullable=True),
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sa.Column("contract_version_id", sa.Integer(), nullable=True),
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# SQLite NUMERIC coercion binds Decimal values as binary floats. Store
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# fixed-width decimal text there, while retaining Numeric semantics on
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# other supported dialects.
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sa.Column("quantity", ExactDecimal(15, 6), nullable=False),
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sa.Column("cost", ExactDecimal(15, 9), nullable=False),
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sa.Column("currency", sa.String(length=8), nullable=False),
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sa.Column("cost_breakdown", sa.JSON(), nullable=False),
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sa.Column("pricing_snapshot", sa.JSON(), nullable=False),
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sa.Column("quality", sa.String(length=32), nullable=False),
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sa.Column("degraded", sa.Boolean(), nullable=False, server_default=sa.false()),
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sa.Column("degraded_reason", sa.String(length=255), nullable=True),
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sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
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sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False),
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sa.ForeignKeyConstraint(["meter_id"], ["meter.id"], ondelete="RESTRICT"),
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sa.ForeignKeyConstraint(
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["source_binding_id"], ["meter_source_binding.id"], ondelete="RESTRICT"
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),
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sa.ForeignKeyConstraint(
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["contract_version_id"], ["energy_contract_version.id"], ondelete="RESTRICT"
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),
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sa.CheckConstraint(
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"degraded OR (meter_id IS NOT NULL AND source_binding_id IS NOT NULL "
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"AND contract_version_id IS NOT NULL)",
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name="ck_meter_cost_period_normal_audit_links",
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),
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sa.CheckConstraint("period_end > period_start", name="ck_meter_cost_period_positive_interval"),
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sa.CheckConstraint(
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"NOT degraded OR (degraded_reason IS NOT NULL AND length(trim(degraded_reason)) > 0)",
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name="ck_meter_cost_period_degraded_reason",
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),
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sa.PrimaryKeyConstraint("id"),
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sa.UniqueConstraint("commodity", "period_start", name="uq_meter_cost_period_commodity_start"),
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)
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op.create_index(
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"ix_meter_cost_period_commodity_start", "meter_cost_period", ["commodity", "period_start"]
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)
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op.create_index(
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"ix_meter_cost_period_source_binding_id", "meter_cost_period", ["source_binding_id"]
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)
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def downgrade() -> None:
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op.drop_index("ix_meter_cost_period_source_binding_id", table_name="meter_cost_period")
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op.drop_index("ix_meter_cost_period_commodity_start", table_name="meter_cost_period")
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op.drop_table("meter_cost_period")
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