fix: grant PostgreSQL schema permissions in install.sh and complete sqlite3 removal

- Add schema permission grants for PostgreSQL 15+ compatibility
- Grant ALL ON SCHEMA public to shells user
- Grant privileges on tables and sequences
- Set default privileges for future objects
- Remove last sqlite3 imports from monitoring and hera modules
- Update monitoring storage to use PostgreSQL
- This fixes "permission denied for schema public" error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: CodeMonkeyCybersecurity

install.sh

@@ -463,6 +463,14 @@ setup_postgresql() {
       sudo -u postgres psql -c "CREATE DATABASE shells;" 2>/dev/null || log INFO " Database 'shells' already exists"
       sudo -u postgres psql -c "CREATE USER shells WITH PASSWORD 'shells_password';" 2>/dev/null || log INFO " User 'shells' already exists"
       sudo -u postgres psql -c "GRANT ALL PRIVILEGES ON DATABASE shells TO shells;" 2>/dev/null || true
+
+      # Grant schema permissions (required for PostgreSQL 15+)
+      log INFO " Granting schema permissions to shells user..."
+      sudo -u postgres psql shells -c "GRANT ALL ON SCHEMA public TO shells;" 2>/dev/null || true
+      sudo -u postgres psql shells -c "GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO shells;" 2>/dev/null || true
+      sudo -u postgres psql shells -c "GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public TO shells;" 2>/dev/null || true
+      sudo -u postgres psql shells -c "ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT ALL ON TABLES TO shells;" 2>/dev/null || true
+      sudo -u postgres psql shells -c "ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT ALL ON SEQUENCES TO shells;" 2>/dev/null || true
     else
       log WARN " Could not create database (sudo or postgres user not available)"
       log WARN " Please create manually: CREATE DATABASE shells;"