adding post table

python/alembic/env.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import logging
+import re
 import sys
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Literal
@@ -81,7 +82,13 @@ def include_name(
 
     """
     if type_ == "schema":
+        # allows a database with multiple schemas to have separate alembic revisions
         return name == target_metadata.schema
+    if type_ == "table":
+        # Exclude weekly partition tables (e.g. posts_2024_01) from autogenerate.
+        # They are created via PARTITION OF in migrations. PG propagates schema changes
+        # from the parent table to all partitions, so only the parent needs ALTER statements.
+        return name and re.match(r"^posts_\d{4}_\d{2}$", name)
     return True
 
 

python/orm/data_science_dev/models.py

@@ -1,3 +1,10 @@
 """Data science dev database ORM models."""
 
 from __future__ import annotations
+
+from python.orm.data_science_dev.posts import partitions  # noqa: F401 — registers partition classes in metadata
+from python.orm.data_science_dev.posts.tables import Posts
+
+__all__ = [
+    "Posts",
+]

python/orm/data_science_dev/posts/__init__.py

@@ -0,0 +1,9 @@
+"""Posts module — weekly-partitioned posts table and partition ORM models."""
+
+from __future__ import annotations
+
+from python.orm.data_science_dev.posts.tables import Posts
+
+__all__ = [
+    "Posts",
+]

python/orm/data_science_dev/posts/columns.py

@@ -0,0 +1,33 @@
+"""Shared column definitions for the posts partitioned table family."""
+
+from __future__ import annotations
+
+from datetime import datetime
+
+from sqlalchemy import BigInteger, SmallInteger, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+
+class PostsColumns:
+    """Mixin providing all posts columns. Used by both the parent table and partitions."""
+
+    post_id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
+    user_id: Mapped[int] = mapped_column(BigInteger)
+    instance: Mapped[str]
+    date: Mapped[datetime] = mapped_column(primary_key=True)
+    text: Mapped[str] = mapped_column(Text)
+    langs: Mapped[str | None]
+    like_count: Mapped[int]
+    reply_count: Mapped[int]
+    repost_count: Mapped[int]
+    reply_to: Mapped[int | None] = mapped_column(BigInteger)
+    replied_author: Mapped[int | None] = mapped_column(BigInteger)
+    thread_root: Mapped[int | None] = mapped_column(BigInteger)
+    thread_root_author: Mapped[int | None] = mapped_column(BigInteger)
+    repost_from: Mapped[int | None] = mapped_column(BigInteger)
+    reposted_author: Mapped[int | None] = mapped_column(BigInteger)
+    quotes: Mapped[int | None] = mapped_column(BigInteger)
+    quoted_author: Mapped[int | None] = mapped_column(BigInteger)
+    labels: Mapped[str | None]
+    sent_label: Mapped[int | None] = mapped_column(SmallInteger)
+    sent_score: Mapped[float | None]

python/orm/data_science_dev/posts/partitions.py

@@ -0,0 +1,71 @@
+"""Dynamically generated ORM classes for each weekly partition of the posts table.
+
+Each class maps to a PostgreSQL partition table (e.g. posts_2024_01).
+These are real ORM models tracked by Alembic autogenerate.
+
+Uses ISO week numbering (datetime.isocalendar().week). ISO years can have
+52 or 53 weeks, and week boundaries are always Monday to Monday.
+"""
+
+from __future__ import annotations
+
+import sys
+from datetime import UTC, datetime
+
+from python.orm.data_science_dev.base import DataScienceDevBase
+from python.orm.data_science_dev.posts.columns import PostsColumns
+
+PARTITION_START_YEAR = 2024
+PARTITION_END_YEAR = 2025
+
+_current_module = sys.modules[__name__]
+
+
+def iso_weeks_in_year(year: int) -> int:
+    """Return the number of ISO weeks in a given year (52 or 53)."""
+    dec_28 = datetime(year, 12, 28, tzinfo=UTC)
+    return dec_28.isocalendar().week
+
+
+def week_bounds(year: int, week: int) -> tuple[datetime, datetime]:
+    """Return (start, end) datetimes for an ISO week.
+
+    Start = Monday 00:00:00 UTC of the given ISO week.
+    End   = Monday 00:00:00 UTC of the following ISO week.
+    """
+    start = datetime.fromisocalendar(year, week, 1).replace(tzinfo=UTC)
+    if week < iso_weeks_in_year(year):
+        end = datetime.fromisocalendar(year, week + 1, 1).replace(tzinfo=UTC)
+    else:
+        end = datetime.fromisocalendar(year + 1, 1, 1).replace(tzinfo=UTC)
+    return start, end
+
+
+def _build_partition_classes() -> dict[str, type]:
+    """Generate one ORM class per ISO week partition."""
+    classes: dict[str, type] = {}
+
+    for year in range(PARTITION_START_YEAR, PARTITION_END_YEAR + 1):
+        for week in range(1, iso_weeks_in_year(year) + 1):
+            class_name = f"PostsWeek{year}W{week:02d}"
+            table_name = f"posts_{year}_{week:02d}"
+
+            partition_class = type(
+                class_name,
+                (PostsColumns, DataScienceDevBase),
+                {
+                    "__tablename__": table_name,
+                    "__table_args__": ({"implicit_returning": False},),
+                },
+            )
+
+            classes[class_name] = partition_class
+
+    return classes
+
+
+# Generate all partition classes and register them on this module
+_partition_classes = _build_partition_classes()
+for _name, _cls in _partition_classes.items():
+    setattr(_current_module, _name, _cls)
+__all__ = list(_partition_classes.keys())

python/orm/data_science_dev/posts/tables.py

@@ -0,0 +1,13 @@
+"""Posts parent table with PostgreSQL weekly range partitioning on date column."""
+
+from __future__ import annotations
+
+from python.orm.data_science_dev.base import DataScienceDevBase
+from python.orm.data_science_dev.posts.columns import PostsColumns
+
+
+class Posts(PostsColumns, DataScienceDevBase):
+    """Parent partitioned table for posts, partitioned by week on `date`."""
+
+    __tablename__ = "posts"
+    __table_args__ = ({"postgresql_partition_by": "RANGE (date)"},)