release: bump version to 0.58.0

Release 0.58.0 includes the Earth high-precision boundary PMTiles/MVT pipeline, standardized Earth boundary source collectors, China POV boundary configuration templates, and removal of the legacy low-precision GeoJSON fallback. It also adds Earth news target-location queueing/archive support, fixes datasource task status visibility, documents the Earth surface depth-spacing rules that prevent far-zoom z-fighting snow/black blocks, and updates bilingual operations/developer docs.

backend/app/models/__init__.py

@@ -16,6 +16,7 @@ from app.models.playground_message import PlaygroundMessage
 from app.models.system_log import SystemLog, AuditLog
 from app.models.vessel import AISConflictRecord, AISRawObservation, AISSourceHealth, VesselPosition, VesselStatic
 from app.models.datasource_mapping import DataSourceMappingTemplate
+from app.models.earth_news import EarthNewsItem
 
 __all__ = [
     "User",
@@ -43,4 +44,5 @@ __all__ = [
     "AISConflictRecord",
     "AISSourceHealth",
     "DataSourceMappingTemplate",
+    "EarthNewsItem",
 ]

backend/app/models/earth_news.py

@@ -0,0 +1,35 @@
+from sqlalchemy import Boolean, Column, DateTime, Float, Index, JSON, String, Text
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class EarthNewsItem(Base):
+    __tablename__ = "earth_news_items"
+
+    id = Column(String(160), primary_key=True)
+    title = Column(String(500), nullable=False)
+    summary = Column(Text, nullable=False, default="")
+    url = Column(Text, nullable=False)
+    source = Column(String(255), nullable=False, default="")
+    feed_name = Column(String(255), nullable=False, default="")
+    region = Column(String(80), nullable=False, index=True)
+    homepage_url = Column(Text, nullable=False, default="")
+    published_at = Column(DateTime(timezone=True), nullable=True, index=True)
+
+    latitude = Column(Float, nullable=False)
+    longitude = Column(Float, nullable=False)
+    location_label = Column(String(255), nullable=False)
+    location_source = Column(String(80), nullable=False, default="region_anchor")
+    verified = Column(Boolean, nullable=False, default=False, index=True)
+    location_meta = Column(JSON, nullable=False, default=dict)
+
+    first_seen_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
+    last_seen_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False, index=True)
+    resolved_at = Column(DateTime(timezone=True), nullable=True, index=True)
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+
+    __table_args__ = (
+        Index("idx_earth_news_region_published", "region", "published_at"),
+        Index("idx_earth_news_region_seen", "region", "last_seen_at"),
+    )