M1-T01: add app-chain revision creating location + poo_records tables

Add alembic_app revision 20260611_06_merge_location_poo_tables that builds
empty location and poo_records tables (REAL float columns, matching the
production schema and the adopt scripts' EXPECTED_*_TABLE_INFO constants).
Update APP_BASELINE_REVISION to the new head. Schema-only; data migration
is handled separately by scripts/migrate_legacy_data.py (M1-T02).

alembic_app/versions/20260611_06_merge_location_poo_tables.py

@@ -0,0 +1,43 @@
+"""merge location and poo_records tables into app chain
+
+Revision ID: 20260611_06_merge_location_poo_tables
+Revises: 20260429_05_public_ip_monitor
+Create Date: 2026-06-11 00:00:01.000000
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "20260611_06_merge_location_poo_tables"
+down_revision: Union[str, None] = "20260429_05_public_ip_monitor"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "location",
+        sa.Column("person", sa.Text(), nullable=False),
+        sa.Column("datetime", sa.Text(), nullable=False),
+        sa.Column("latitude", sa.REAL(), nullable=False),
+        sa.Column("longitude", sa.REAL(), nullable=False),
+        sa.Column("altitude", sa.REAL(), nullable=True),
+        sa.PrimaryKeyConstraint("person", "datetime"),
+    )
+
+    op.create_table(
+        "poo_records",
+        sa.Column("timestamp", sa.Text(), nullable=False),
+        sa.Column("status", sa.Text(), nullable=False),
+        sa.Column("latitude", sa.REAL(), nullable=False),
+        sa.Column("longitude", sa.REAL(), nullable=False),
+        sa.PrimaryKeyConstraint("timestamp"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("poo_records")
+    op.drop_table("location")

scripts/app_db_adopt.py

@@ -15,7 +15,7 @@ if str(PROJECT_ROOT) not in sys.path:
 
 from app.config import get_settings
 
-APP_BASELINE_REVISION = "20260429_05_public_ip_monitor"
+APP_BASELINE_REVISION = "20260611_06_merge_location_poo_tables"
 
 
 class AppDatabaseAdoptionError(RuntimeError):