项目概览、参与者管理初步优化（未接入真实数据）

backend/alembic/env.py

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+from __future__ import annotations
+
+import asyncio
+import os
+import sys
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import pool
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+
+from app.core.config import settings
+from app.db.base import Base
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+
+def _get_database_url() -> str:
+    url = os.getenv("DATABASE_URL", settings.DATABASE_URL)
+    if url and url.startswith("postgresql+asyncpg://"):
+        return url
+    return url
+
+
+def run_migrations_offline() -> None:
+    url = _get_database_url()
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection) -> None:
+    context.configure(connection=connection, target_metadata=target_metadata)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_migrations_online() -> None:
+    configuration = config.get_section(config.config_ini_section, {})
+    configuration["sqlalchemy.url"] = _get_database_url()
+
+    connectable = async_engine_from_config(
+        configuration,
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+
+    await connectable.dispose()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    asyncio.run(run_migrations_online())

backend/alembic/versions/20240501_000003_drop_visit_name_from_visits.py

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+"""drop visit_name from visits"""
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = "20240501_000003"
+down_revision = "20240501_000002"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.drop_column("visits", "visit_name")
+
+
+def downgrade() -> None:
+    op.add_column(
+        "visits",
+        sa.Column("visit_name", sa.String(length=200), nullable=False, server_default=""),
+    )

backend/alembic/versions/20240501_000004_add_visit_template_to_studies.py

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+"""add visit template fields to studies"""
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = "20240501_000004"
+down_revision = "20240501_000003"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column("studies", sa.Column("visit_interval_days", sa.Integer(), nullable=True))
+    op.add_column("studies", sa.Column("visit_total", sa.Integer(), nullable=True))
+    op.add_column("studies", sa.Column("visit_window_start_offset", sa.Integer(), nullable=True))
+    op.add_column("studies", sa.Column("visit_window_end_offset", sa.Integer(), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column("studies", "visit_window_end_offset")
+    op.drop_column("studies", "visit_window_start_offset")
+    op.drop_column("studies", "visit_total")
+    op.drop_column("studies", "visit_interval_days")

backend/alembic/versions/20240501_000005_add_consent_date_to_subjects.py

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+"""add consent_date to subjects"""
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = "20240501_000005"
+down_revision = "20240501_000004"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column("subjects", sa.Column("consent_date", sa.Date(), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column("subjects", "consent_date")