refactor: simplify database logging handler

- Remove retry logic from DatabaseLogHandler (was for SQLite locking)
- Streamline error handling in log emission
- Clean up platform health service

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/core/lifespan.py

@@ -47,9 +47,12 @@ def check_database_ready():
     """Check if database is ready (migrations have been run)."""
     try:
         with engine.connect() as conn:
-            # Try to query a table that should exist
+            # Check for tables in the public schema (PostgreSQL)
             result = conn.execute(
-                text("SELECT name FROM sqlite_master WHERE type='table' LIMIT 1")
+                text(
+                    "SELECT tablename FROM pg_catalog.pg_tables "
+                    "WHERE schemaname = 'public' LIMIT 1"
+                )
             )
             tables = result.fetchall()
             return len(tables) > 0

app/core/logging.py

@@ -23,21 +23,14 @@ class DatabaseLogHandler(logging.Handler):
     Custom logging handler that stores WARNING, ERROR, and CRITICAL logs in database.
 
     Runs asynchronously to avoid blocking application performance.
-    Uses retry logic for SQLite database locking issues.
     """
 
-    MAX_RETRIES = 3
-    RETRY_DELAY = 0.1  # 100ms delay between retries
-
     def __init__(self):
         super().__init__()
         self.setLevel(logging.WARNING)  # Only log WARNING and above to database
 
     def emit(self, record):
-        """Emit a log record to the database with retry logic for SQLite locking."""
-        import time
-
-        for attempt in range(self.MAX_RETRIES):
+        """Emit a log record to the database."""
         try:
             from app.core.database import SessionLocal
             from models.database.admin import ApplicationLog
@@ -90,17 +83,10 @@ class DatabaseLogHandler(logging.Handler):
 
                 db.add(log_entry)
                 db.commit()
-                    return  # Success, exit retry loop
 
-                except Exception as e:
+            except Exception:
                 db.rollback()
-                    # Check if it's a database locked error
-                    if "database is locked" in str(e).lower():
-                        if attempt < self.MAX_RETRIES - 1:
-                            time.sleep(self.RETRY_DELAY * (attempt + 1))
-                            continue
-                    # For other errors or final attempt, silently skip
-                    # Don't print to stderr to avoid log spam during imports
+                # Silently skip - don't print to stderr to avoid log spam
             finally:
                 db.close()
 
@@ -108,8 +94,6 @@ class DatabaseLogHandler(logging.Handler):
             # Silently fail - logging should never crash the app
             pass
 
-            break  # Exit retry loop on non-recoverable errors
-
 
 def get_log_level_from_db():
     """

app/services/platform_health_service.py

@@ -305,27 +305,13 @@ class PlatformHealthService:
     def _get_database_size(self, db: Session) -> float:
         """Get database size in MB."""
         try:
-            # Try SQLite approach
-            result = db.execute(
-                text(
-                    "SELECT page_count * page_size as size "
-                    "FROM pragma_page_count(), pragma_page_size()"
-                )
-            )
-            row = result.fetchone()
-            if row:
-                return round(row[0] / (1024 * 1024), 2)
-        except Exception:
-            pass
-
-        try:
-            # Try PostgreSQL approach
             result = db.execute(text("SELECT pg_database_size(current_database())"))
             row = result.fetchone()
             if row:
                 return round(row[0] / (1024 * 1024), 2)
         except Exception:
-            pass
+            logger.warning("Failed to get database size")
+            return 0.0
 
         return 0.0