Backend: table groups with prefix/color, auto-numbering, has_active_order flag

TableGroup gains prefix and color columns for display in the PWA zone filter.
Table creation now assigns a global auto-increment number; batch creation uses
group-local label numbering (avoids gaps/conflicts when adding to existing groups).
DELETE table now blocks if an active order exists (soft or hard delete).
Hard delete cascades past orders before removing the table row.
list_tables enriches each TableOut with has_active_order computed server-side.
TableOut no longer requires number in the input payload; TableCreate simplified.

Migration runner refactored to give each ALTER TABLE its own connection so a
no-op (column already exists) doesn't leave a dirty transaction blocking later
migrations. New migrations added for all new columns.

Order.print_logs relationship gains cascade="all, delete-orphan" so print logs
are removed when an order is deleted.

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

local_backend/schemas/table.py

@@ -4,40 +4,45 @@ from typing import Optional, List
 
 class TableGroupCreate(BaseModel):
     name: str
+    prefix: Optional[str] = None
+    color: Optional[str] = None
 
 
 class TableGroupUpdate(BaseModel):
     name: Optional[str] = None
+    prefix: Optional[str] = None
+    color: Optional[str] = None
 
 
 class TableGroupOut(BaseModel):
     id: int
     name: str
+    prefix: Optional[str] = None
     sort_order: int = 0
+    color: Optional[str] = None
 
     model_config = {"from_attributes": True}
 
 
 class TableBase(BaseModel):
-    number: int
     label: Optional[str] = None
     group_id: Optional[int] = None
     is_active: bool = True
 
 
-class TableCreate(TableBase):
-    pass
+class TableCreate(BaseModel):
+    label: Optional[str] = None
+    group_id: Optional[int] = None
 
 
 class TableBatchCreate(BaseModel):
     group_id: Optional[int] = None
     count: int
-    name_prefix: str  # e.g. "Out-" → Out-1, Out-2 ...
-    start_number: int = 1
+    name_prefix: str  # e.g. "TBL-" → TBL-1, TBL-2 ...
+    # start_number is computed on the backend from existing tables in the group
 
 
 class TableUpdate(BaseModel):
-    number: Optional[int] = None
     label: Optional[str] = None
     group_id: Optional[int] = None
     is_active: Optional[bool] = None
@@ -48,10 +53,15 @@ class TableFloorplanUpdate(BaseModel):
     floor_y: float
 
 
-class TableOut(TableBase):
+class TableOut(BaseModel):
     id: int
+    number: int
+    label: Optional[str] = None
+    group_id: Optional[int] = None
+    is_active: bool = True
     floor_x: Optional[float] = None
     floor_y: Optional[float] = None
     group: Optional[TableGroupOut] = None
+    has_active_order: bool = False
 
     model_config = {"from_attributes": True}