feat(projects): automate project infrastructure provisioning

app/infra/db/postgresql/project_spatial.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+from app.native.wndb.core.connection import project_connection
+
+
+def get_project_map_bbox(project: str) -> tuple[float, float, float, float]:
+    """Return the combined published node/link bounds in EPSG:3857."""
+    with project_connection(project) as conn, conn.cursor() as cur:
+        cur.execute(
+            """
+            with project_geometries as (
+                select geom from gis.junctions
+                union all
+                select geom from gis.pipes
+            ), bounds as (
+                select ST_Extent(geom) as extent from project_geometries
+            )
+            select ST_XMin(extent) as minx,
+                   ST_YMin(extent) as miny,
+                   ST_XMax(extent) as maxx,
+                   ST_YMax(extent) as maxy
+            from bounds
+            """
+        )
+        row = cur.fetchone()
+    if row is None or any(
+        row[key] is None for key in ("minx", "miny", "maxx", "maxy")
+    ):
+        raise RuntimeError("Imported model has no publishable GIS geometry")
+    return tuple(float(row[key]) for key in ("minx", "miny", "maxx", "maxy"))