Squashed 'core/' content from commit 92ec910

git-subtree-dir: core
git-subtree-split: 92ec910a132e379a3a6e442a75bcb07cac0f0010

backend/alembic/versions/002_add_system_settings.py

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+"""Add system_settings table
+
+Revision ID: 002_system_settings
+Revises: 001_initial
+Create Date: 2026-04-02
+"""
+from alembic import op
+import sqlalchemy as sa
+
+revision = "002_system_settings"
+down_revision = "001_initial"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "system_settings",
+        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+        sa.Column("key", sa.String(100), unique=True, nullable=False, index=True),
+        sa.Column("value", sa.Text, nullable=False, server_default=""),
+        sa.Column("description", sa.String(255)),
+        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
+    )
+
+    # Seed default settings
+    op.execute("""
+        INSERT INTO system_settings (key, value, description) VALUES
+        ('platform_name', '天普零碳园区智慧能源管理平台', '平台名称'),
+        ('data_retention_days', '365', '数据保留天数'),
+        ('alarm_auto_resolve_minutes', '30', '告警自动解除时间(分钟)'),
+        ('simulator_interval_seconds', '15', '模拟器采集间隔(秒)'),
+        ('notification_email_enabled', 'false', '是否启用邮件通知'),
+        ('notification_email_smtp', '', 'SMTP服务器地址'),
+        ('report_auto_schedule_enabled', 'false', '是否启用自动报表'),
+        ('timezone', 'Asia/Shanghai', '系统时区')
+    """)
+
+
+def downgrade() -> None:
+    op.drop_table("system_settings")