Month 2025-12 monthly summary for googleapis/java-spanner-cassandra focusing on feature delivery and technical accomplishments. Key feature delivered: Spanner Connection Configuration Options, enabling override of the Spanner endpoint and plaintext (non-TLS) connections. This provides users with the ability to toggle between secure TLS and plaintext modes and customize the endpoint, improving flexibility for testing, on-prem/legacy environments, and non-standard deployments. The change corresponds to commit e5a5e3dac2e319dcf13f5a439ec9fa7cd97f3be3 (feat: expose options to override spanner endpoint and talking to spanner with plaintext connection). Major bugs fixed: none reported this month. Overall impact: empowers customers with configurable connectivity, enhances integration scenarios, and reduces setup friction for diverse deployment options. Accomplishments: delivered a maintainable, backward-compatible configuration pathway; validated with repository googleapis/java-spanner-cassandra; lays groundwork for future security-mode enhancements. Technologies/skills demonstrated: Java, API design, configuration management, versioned commits, change impact assessment, and collaboration around feature flags and deployment flexibility.