fix: resolve Python deprecation warnings in database and openeo_client

Replace datetime.utcnow() with datetime.now(UTC) and bitwise ~bool
with == 0 comparison to silence warnings ahead of Python 3.16.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

app/database.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import json
 import uuid
-from datetime import datetime
+from datetime import datetime, UTC
 
 import aiosqlite
 
@@ -48,7 +48,7 @@ class Database:
     async def create_job(self, request: JobRequest) -> str:
         await self._ensure_init()
         job_id = uuid.uuid4().hex[:12]
-        now = datetime.utcnow().isoformat()
+        now = datetime.now(UTC).isoformat()
         async with aiosqlite.connect(self.db_path) as db:
             await db.execute(
                 "INSERT INTO jobs (id, request_json, status, created_at, updated_at, email) VALUES (?, ?, ?, ?, ?, ?)",
@@ -71,7 +71,7 @@ class Database:
         self, job_id: str, status: JobStatus, error: str | None = None
     ) -> None:
         await self._ensure_init()
-        now = datetime.utcnow().isoformat()
+        now = datetime.now(UTC).isoformat()
         async with aiosqlite.connect(self.db_path) as db:
             await db.execute(
                 "UPDATE jobs SET status = ?, error = ?, updated_at = ? WHERE id = ?",
@@ -83,7 +83,7 @@ class Database:
         self, job_id: str, indicator_id: str, indicator_status: str
     ) -> None:
         await self._ensure_init()
-        now = datetime.utcnow().isoformat()
+        now = datetime.now(UTC).isoformat()
         async with aiosqlite.connect(self.db_path) as db:
             cursor = await db.execute(
                 "SELECT progress_json FROM jobs WHERE id = ?", (job_id,)
@@ -99,7 +99,7 @@ class Database:
 
     async def save_job_result(self, job_id: str, result: IndicatorResult) -> None:
         await self._ensure_init()
-        now = datetime.utcnow().isoformat()
+        now = datetime.now(UTC).isoformat()
         async with aiosqlite.connect(self.db_path) as db:
             cursor = await db.execute(
                 "SELECT results_json FROM jobs WHERE id = ?", (job_id,)

app/openeo_client.py

@@ -102,7 +102,7 @@ def build_ndvi_graph(
     # Cloud mask: keep only vegetation, bare soil, water (SCL classes 4,5,6)
     scl = cube.band("SCL")
     cloud_mask = (scl == 4) | (scl == 5) | (scl == 6)
-    cube = cube.mask(~cloud_mask)
+    cube = cube.mask(cloud_mask == 0)
 
     # NDVI
     b08 = cube.band("B08")
@@ -143,7 +143,7 @@ def build_true_color_graph(
     # Cloud mask
     scl = cube.band("SCL")
     cloud_mask = (scl == 4) | (scl == 5) | (scl == 6)
-    cube = cube.mask(~cloud_mask)
+    cube = cube.mask(cloud_mask == 0)
 
     # Drop SCL, keep RGB
     rgb = cube.filter_bands(["B02", "B03", "B04"])
@@ -179,7 +179,7 @@ def build_mndwi_graph(
 
     scl = cube.band("SCL")
     cloud_mask = (scl == 4) | (scl == 5) | (scl == 6)
-    cube = cube.mask(~cloud_mask)
+    cube = cube.mask(cloud_mask == 0)
 
     b03 = cube.band("B03")
     b11 = cube.band("B11")
@@ -279,7 +279,7 @@ def build_buildup_graph(
     # Cloud mask: keep only vegetation, bare soil, water (SCL classes 4,5,6)
     scl = cube.band("SCL")
     cloud_mask = (scl == 4) | (scl == 5) | (scl == 6)
-    cube = cube.mask(~cloud_mask)
+    cube = cube.mask(cloud_mask == 0)
 
     # NDBI = (SWIR - NIR) / (SWIR + NIR)
     b11 = cube.band("B11")