feat(etl-cache): add CachedParse table model

surfsense_backend/app/etl_pipeline/cache/persistence/models.py

@@ -0,0 +1,49 @@
+"""``etl_cache_parses``: one reusable parser result per (bytes + recipe)."""
+
+from __future__ import annotations
+
+from sqlalchemy import (
+    BigInteger,
+    Column,
+    DateTime,
+    Index,
+    Integer,
+    String,
+    UniqueConstraint,
+)
+
+from app.db import BaseModel, TimestampMixin
+
+
+class CachedParse(BaseModel, TimestampMixin):
+    __tablename__ = "etl_cache_parses"
+
+    # Key: raw bytes + the recipe that produced the markdown.
+    source_sha256 = Column(String(64), nullable=False)
+    etl_service = Column(String(32), nullable=False)
+    mode = Column(String(16), nullable=False)
+    parser_version = Column(Integer, nullable=False)
+
+    # Where the markdown blob lives (kept out of the row to stay small).
+    storage_backend = Column(String(32), nullable=False)
+    storage_key = Column(String, nullable=False)
+    size_bytes = Column(BigInteger, nullable=False)
+
+    # Payload needed to rebuild the EtlResult on a hit.
+    content_type = Column(String(32), nullable=False)
+    actual_pages = Column(Integer, nullable=False, default=0, server_default="0")
+
+    # Drives eviction (popularity + recency).
+    times_reused = Column(BigInteger, nullable=False, default=0, server_default="0")
+    last_used_at = Column(DateTime(timezone=True), nullable=False)
+
+    __table_args__ = (
+        UniqueConstraint(
+            "source_sha256",
+            "etl_service",
+            "mode",
+            "parser_version",
+            name="uq_etl_cache_parses_key",
+        ),
+        Index("ix_etl_cache_parses_last_used_at", "last_used_at"),
+    )