Decouple blog models and BlogService from shared layer

Move Post/Author/Tag/PostAuthor/PostTag/PostUser models from
shared/models/ghost_content.py to blog/models/content.py so blog-domain
models no longer live in the shared layer. Replace the shared
SqlBlogService + BlogService protocol with a blog-local singleton
(blog_service), and switch entry_associations.py from direct DB access
to HTTP fetch_data("blog", "post-by-id") to respect the inter-service
boundary.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/models/__init__.py

@@ -10,7 +10,6 @@ from .ghost_membership_entities import (
     GhostNewsletter, UserNewsletter,
     GhostTier, GhostSubscription,
 )
-from .ghost_content import Tag, Post, Author, PostAuthor, PostTag
 from .page_config import PageConfig
 from .order import Order, OrderItem
 from .market import (

shared/models/ghost_content.py

@@ -1,208 +0,0 @@
-from datetime import datetime
-from typing import List, Optional
-from sqlalchemy.orm import Mapped, mapped_column, relationship
-from sqlalchemy import (
-    Integer,
-    String,
-    Text,
-    Boolean,
-    DateTime,
-    ForeignKey,
-    Column,
-    func,
-)
-from shared.db.base import Base  # whatever your Base is
-# from .author import Author  # make sure imports resolve
-# from ..app.blog.calendars.model import Calendar
-
-class Tag(Base):
-    __tablename__ = "tags"
-
-    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
-    ghost_id: Mapped[Optional[str]] = mapped_column(String(64), index=True, unique=True, nullable=True)
-
-    slug: Mapped[str] = mapped_column(String(191), index=True, nullable=False)
-    name: Mapped[str] = mapped_column(String(255), nullable=False)
-
-    description: Mapped[Optional[str]] = mapped_column(Text())
-    visibility: Mapped[str] = mapped_column(String(32), default="public", nullable=False)
-    feature_image: Mapped[Optional[str]] = mapped_column(Text())
-
-    meta_title: Mapped[Optional[str]] = mapped_column(String(300))
-    meta_description: Mapped[Optional[str]] = mapped_column(Text())
-
-    created_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
-    updated_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
-    deleted_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
-
-    # NEW: posts relationship is now direct Post objects via PostTag
-    posts: Mapped[List["Post"]] = relationship(
-        "Post",
-        secondary="post_tags",
-        primaryjoin="Tag.id==post_tags.c.tag_id",
-        secondaryjoin="Post.id==post_tags.c.post_id",
-        back_populates="tags",
-        order_by="PostTag.sort_order",
-    )
-
-
-class Post(Base):
-    __tablename__ = "posts"
-
-    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
-    ghost_id: Mapped[Optional[str]] = mapped_column(String(64), index=True, unique=True, nullable=True)
-    uuid: Mapped[str] = mapped_column(String(64), unique=True, nullable=False, server_default=func.gen_random_uuid())
-    slug: Mapped[str] = mapped_column(String(191), index=True, nullable=False)
-
-    title: Mapped[str] = mapped_column(String(500), nullable=False)
-
-    html: Mapped[Optional[str]] = mapped_column(Text())
-    plaintext: Mapped[Optional[str]] = mapped_column(Text())
-    mobiledoc: Mapped[Optional[str]] = mapped_column(Text())
-    lexical: Mapped[Optional[str]] = mapped_column(Text())
-
-    feature_image: Mapped[Optional[str]] = mapped_column(Text())
-    feature_image_alt: Mapped[Optional[str]] = mapped_column(Text())
-    feature_image_caption: Mapped[Optional[str]] = mapped_column(Text())
-
-    excerpt: Mapped[Optional[str]] = mapped_column(Text())
-    custom_excerpt: Mapped[Optional[str]] = mapped_column(Text())
-
-    visibility: Mapped[str] = mapped_column(String(32), default="public", nullable=False)
-    status: Mapped[str] = mapped_column(String(32), default="draft", nullable=False)
-    featured: Mapped[bool] = mapped_column(Boolean(), default=False, nullable=False)
-    is_page: Mapped[bool] = mapped_column(Boolean(), default=False, nullable=False)
-    email_only: Mapped[bool] = mapped_column(Boolean(), default=False, nullable=False)
-
-    canonical_url: Mapped[Optional[str]] = mapped_column(Text())
-    meta_title: Mapped[Optional[str]] = mapped_column(String(500))
-    meta_description: Mapped[Optional[str]] = mapped_column(Text())
-    og_image: Mapped[Optional[str]] = mapped_column(Text())
-    og_title: Mapped[Optional[str]] = mapped_column(String(500))
-    og_description: Mapped[Optional[str]] = mapped_column(Text())
-    twitter_image: Mapped[Optional[str]] = mapped_column(Text())
-    twitter_title: Mapped[Optional[str]] = mapped_column(String(500))
-    twitter_description: Mapped[Optional[str]] = mapped_column(Text())
-    custom_template: Mapped[Optional[str]] = mapped_column(String(191))
-
-    reading_time: Mapped[Optional[int]] = mapped_column(Integer())
-    comment_id: Mapped[Optional[str]] = mapped_column(String(191))
-
-    published_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
-    updated_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), server_default=func.now())
-    created_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), server_default=func.now())
-    deleted_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
-
-    user_id: Mapped[Optional[int]] = mapped_column(
-        Integer, index=True
-    )
-    publish_requested: Mapped[bool] = mapped_column(Boolean(), default=False, server_default="false", nullable=False)
-
-    primary_author_id: Mapped[Optional[int]] = mapped_column(
-        Integer, ForeignKey("authors.id", ondelete="SET NULL")
-    )
-    primary_tag_id: Mapped[Optional[int]] = mapped_column(
-        Integer, ForeignKey("tags.id", ondelete="SET NULL")
-    )
-
-    primary_author: Mapped[Optional["Author"]] = relationship(
-        "Author", foreign_keys=[primary_author_id]
-    )
-    primary_tag: Mapped[Optional[Tag]] = relationship(
-        "Tag", foreign_keys=[primary_tag_id]
-    )
-
-    # AUTHORS RELATIONSHIP (many-to-many via post_authors)
-    authors: Mapped[List["Author"]] = relationship(
-        "Author",
-        secondary="post_authors",
-        primaryjoin="Post.id==post_authors.c.post_id",
-        secondaryjoin="Author.id==post_authors.c.author_id",
-        back_populates="posts",
-        order_by="PostAuthor.sort_order",
-    )
-
-    # TAGS RELATIONSHIP (many-to-many via post_tags)
-    tags: Mapped[List[Tag]] = relationship(
-        "Tag",
-        secondary="post_tags",
-        primaryjoin="Post.id==post_tags.c.post_id",
-        secondaryjoin="Tag.id==post_tags.c.tag_id",
-        back_populates="posts",
-        order_by="PostTag.sort_order",
-    )
-
-class Author(Base):
-    __tablename__ = "authors"
-
-    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
-    ghost_id: Mapped[Optional[str]] = mapped_column(String(64), index=True, unique=True, nullable=True)
-
-    slug: Mapped[str] = mapped_column(String(191), index=True, nullable=False)
-    name: Mapped[str] = mapped_column(String(255), nullable=False)
-    email: Mapped[Optional[str]] = mapped_column(String(255))
-
-    profile_image: Mapped[Optional[str]] = mapped_column(Text())
-    cover_image: Mapped[Optional[str]] = mapped_column(Text())
-    bio: Mapped[Optional[str]] = mapped_column(Text())
-    website: Mapped[Optional[str]] = mapped_column(Text())
-    location: Mapped[Optional[str]] = mapped_column(Text())
-    facebook: Mapped[Optional[str]] = mapped_column(Text())
-    twitter: Mapped[Optional[str]] = mapped_column(Text())
-
-    created_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
-    updated_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
-    deleted_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
-
-    # backref to posts via post_authors
-    posts: Mapped[List[Post]] = relationship(
-        "Post",
-        secondary="post_authors",
-        primaryjoin="Author.id==post_authors.c.author_id",
-        secondaryjoin="Post.id==post_authors.c.post_id",
-        back_populates="authors",
-        order_by="PostAuthor.sort_order",
-    )
-
-class PostAuthor(Base):
-    __tablename__ = "post_authors"
-
-    post_id: Mapped[int] = mapped_column(
-        ForeignKey("posts.id", ondelete="CASCADE"),
-        primary_key=True,
-    )
-    author_id: Mapped[int] = mapped_column(
-        ForeignKey("authors.id", ondelete="CASCADE"),
-        primary_key=True,
-    )
-    sort_order: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
-
-
-class PostTag(Base):
-    __tablename__ = "post_tags"
-
-    post_id: Mapped[int] = mapped_column(
-        ForeignKey("posts.id", ondelete="CASCADE"),
-        primary_key=True,
-    )
-    tag_id: Mapped[int] = mapped_column(
-        ForeignKey("tags.id", ondelete="CASCADE"),
-        primary_key=True,
-    )
-    sort_order: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
-
-
-class PostUser(Base):
-    """Multi-author M2M: links posts to users (cross-DB, no FK on user_id)."""
-    __tablename__ = "post_users"
-
-    post_id: Mapped[int] = mapped_column(
-        ForeignKey("posts.id", ondelete="CASCADE"),
-        primary_key=True,
-    )
-    user_id: Mapped[int] = mapped_column(
-        Integer, primary_key=True, index=True,
-    )
-    sort_order: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
-
-