hoàn thành bước tạo docker compose

backend/alembic/env.py

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+"""Alembic environment — wires SQLAlchemy models into the migration engine."""
+
+import os
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+# Load app models so Alembic can inspect metadata
+from app.database import Base  # noqa: F401 — registers Base.metadata
+import app.models  # noqa: F401 — registers all ORM classes
+
+# ── Alembic Config object ─────────────────────────────────────────────────────
+config = context.config
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# Inject DATABASE_URL from environment so it is never hard-coded
+database_url = os.environ["DATABASE_URL"]
+config.set_main_option("sqlalchemy.url", database_url)
+
+target_metadata = Base.metadata
+
+
+# ── Offline migrations (no live DB connection) ────────────────────────────────
+def run_migrations_offline() -> None:
+    context.configure(
+        url=database_url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        compare_type=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+# ── Online migrations (live DB connection) ────────────────────────────────────
+def run_migrations_online() -> None:
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            compare_type=True,
+        )
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

backend/alembic/script.py.mako

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+"""Alembic migration script template."""
+
+# revision identifiers, used by Alembic.
+revision = None
+down_revision = None
+branch_labels = None
+depends_on = None
+
+from alembic import op  # noqa
+
+
+def upgrade() -> None:
+    pass
+
+
+def downgrade() -> None:
+    pass

backend/alembic/versions/0001_initial_schema.py

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+"""initial schema: users, pdfs, annotations
+
+Revision ID: 0001
+Revises:
+Create Date: 2026-03-31
+"""
+
+revision = "0001"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+
+def upgrade() -> None:
+    # ── users ─────────────────────────────────────────────────────────────────
+    op.create_table(
+        "users",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("username", sa.String(length=64), nullable=False),
+        sa.Column("email", sa.String(length=255), nullable=False),
+        sa.Column("password_hash", sa.String(length=255), nullable=False),
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            nullable=False,
+            server_default=sa.text("now()"),
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index("ix_users_id", "users", ["id"])
+    op.create_index("ix_users_username", "users", ["username"], unique=True)
+    op.create_index("ix_users_email", "users", ["email"], unique=True)
+
+    # ── pdfs ──────────────────────────────────────────────────────────────────
+    op.create_table(
+        "pdfs",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("title", sa.String(length=255), nullable=False),
+        sa.Column("file_path", sa.Text(), nullable=False),
+        sa.Column("total_pages", sa.Integer(), nullable=True),
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            nullable=False,
+            server_default=sa.text("now()"),
+        ),
+        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index("ix_pdfs_id", "pdfs", ["id"])
+    op.create_index("ix_pdfs_user_id", "pdfs", ["user_id"])
+
+    # ── annotations ───────────────────────────────────────────────────────────
+    op.create_table(
+        "annotations",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("pdf_id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("page_number", sa.Integer(), nullable=False),
+        sa.Column(
+            "canvas_data",
+            postgresql.JSONB(astext_type=sa.Text()),
+            nullable=False,
+            server_default="{}",
+        ),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(timezone=True),
+            nullable=False,
+            server_default=sa.text("now()"),
+        ),
+        sa.ForeignKeyConstraint(["pdf_id"], ["pdfs.id"], ondelete="CASCADE"),
+        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint(
+            "pdf_id", "user_id", "page_number", name="uq_annotation_pdf_user_page"
+        ),
+    )
+    op.create_index("ix_annotations_id", "annotations", ["id"])
+    op.create_index("ix_annotations_pdf_id", "annotations", ["pdf_id"])
+    op.create_index("ix_annotations_user_id", "annotations", ["user_id"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_annotations_user_id", table_name="annotations")
+    op.drop_index("ix_annotations_pdf_id", table_name="annotations")
+    op.drop_index("ix_annotations_id", table_name="annotations")
+    op.drop_table("annotations")
+
+    op.drop_index("ix_pdfs_user_id", table_name="pdfs")
+    op.drop_index("ix_pdfs_id", table_name="pdfs")
+    op.drop_table("pdfs")
+
+    op.drop_index("ix_users_email", table_name="users")
+    op.drop_index("ix_users_username", table_name="users")
+    op.drop_index("ix_users_id", table_name="users")
+    op.drop_table("users")