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In typical web applications, the read-to-write ratio often exceeds 10:1, and for content-heavy platforms like social media feeds or e-commerce catalogs, ratios of 100:1 or even 1000:1 are common. This asymmetry creates a critical bottleneck. Your primary database—designed to maintain consistency through ACID guarantees—becomes overwhelmed not by data modifications, but by the sheer volume of queries asking *"What is the current state?"* Users refreshing feeds, loading product pages, checking notifications, and searching catalogs collectively hammer your database with read requests that compete for the same CPU, memory, and I/O resources needed for writes. **Read replicas** represent the foundational solution to this challenge. By creating copies of your database that serve read traffic independently, you multiply your read capacity while preserving the integrity guarantees your application demands.71:T4b2,Before implementing read replicas, we must deeply understand *why* reads become the bottleneck and what specific constraints we're addressing. This understanding shapes every architectural decision. **The anatomy of a database read:** When your application executes a SELECT query, the database performs multiple resource-intensive operations: 1. **Query parsing and planning** — The SQL parser validates syntax, the optimizer evaluates execution strategies, and the planner selects indexes and join algorithms 2. **Buffer pool access** — The storage engine checks if required data pages exist in memory (buffer pool hit) or must be loaded from disk (buffer pool miss) 3. **Lock acquisition** — Even read operations may acquire shared locks to prevent inconsistent reads during concurrent modifications 4. **Result materialization** — The engine assembles matching rows, applies projections and aggregations, and prepares the result set 5. **Network transmission** — Results travel from database server to application server, consuming network bandwidth and connection slots Each of these stages consumes finite resources. When read volume grows, these resources become contention points.72:T63f,// Application-level read/write splitting in TypeScript interface DatabaseConfig { primary: ConnectionPool; replicas: ConnectionPool[]; } class DatabaseRouter { private config: DatabaseConfig; private replicaIndex = 0; constructor(config: DatabaseConfig) { this.config = config; } // Write operations always go to primary async write(query: string, params: unknown[]): Promise { return this.config.primary.execute(query, params); } // Read operations round-robin across replicas async read(query: string, params: unknown[]): Promise { const replica = this.selectReplica(); return replica.execute(query, params); } // Read from primary when consistency is critical async readFromPrimary(query: string, params: unknown[]): Promise { return this.config.primary.execute(query, params); } private selectReplica(): ConnectionPool { const replica = this.config.replicas[this.replicaIndex]; this.replicaIndex = (this.replicaIndex + 1) % this.config.replicas.length; return replica; } } // Usage in application code const router = new DatabaseRouter(config); // Write goes to primary await router.write('INSERT INTO orders (user_id, total) VALUES ($1, $2)', [userId, total]); // Read goes to replica const orders = await router.read('SELECT * FROM orders WHERE user_id = $1', [userId]); // Read-your-writes: immediately read from primary after write const justCreated = await router.readFromPrimary('SELECT * FROM orders WHERE id = $1', [orderId]);73:T474,// Example: Prisma Client Extensions for read replicas // Primary connection for writes const primary = new PrismaClient({ datasources: { db: { url: process.env.DATABASE_PRIMARY_URL } } }); // Replica connections for reads const replica1 = new PrismaClient({ datasources: { db: { url: process.env.DATABASE_REPLICA_1_URL } } }); const replica2 = new PrismaClient({ datasources: { db: { url: process.env.DATABASE_REPLICA_2_URL } } }); // Extended client with read/write routing const prisma = primary.$extends({ query: { $allOperations({ operation, args, query }) { // Read operations go to replicas const readOperations = ['findFirst', 'findMany', 'findUnique', 'count', 'aggregate']; if (readOperations.includes(operation)) { // Round-robin replica selection const replica = selectReplica([replica1, replica2]); return replica[model][operation](args); } // Write operations stay on primary return query(args); } } });74:T606,// Replica health check implementation interface ReplicaHealth { isHealthy: boolean; lagSeconds: number; lastChecked: Date; } const MAX_ACCEPTABLE_LAG_SECONDS = 30; const HEALTH_CHECK_INTERVAL_MS = 5000; async function checkReplicaHealth(replica: DatabaseConnection): Promise { try { // Check connectivity with simple query await replica.query('SELECT 1'); // Check replication lag (PostgreSQL example) const lagResult = await replica.query(` SELECT EXTRACT(EPOCH FROM (now() - pg_last_xact_replay_timestamp())) AS lag_seconds `); const lagSeconds = lagResult.rows[0]?.lag_seconds ?? 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This is where horizontal scaling through read replicas becomes essential."},"type":"text"},{"data":{"icon":"AlertCircle","title":"The Shared-Nothing Principle","content":"Read replicas exemplify the shared-nothing architecture principle: instead of scaling a single resource vertically, we create independent processing units that share no state except through explicit replication. Each replica operates autonomously, with its own CPU, memory, and storage. This design enables near-linear scalability—adding replicas proportionally increases read capacity.","variant":"warning"},"type":"callout"}],"titleType":"number","titleNumber":1},{"id":"replica-architecture-fundamentals","title":"Read Replica Architecture Fundamentals","content":[{"data":{"content":"A read replica is a synchronized copy of your primary database that accepts only read queries. The primary database (also called master, leader, or writer) handles all write operations and propagates changes to replicas through a replication mechanism. This architecture separates the concerns of *data modification* from *data retrieval*.\n\n**Core architectural components:**"},"type":"text"},{"data":{"items":["**Primary Database (Writer)** — The authoritative source for all data modifications. Accepts INSERT, UPDATE, DELETE operations and maintains the transaction log (WAL in PostgreSQL, binlog in MySQL) that records every change.","**Replication Stream** — The continuous flow of change events from primary to replicas. May be synchronous (primary waits for replica acknowledgment) or asynchronous (primary continues without waiting).","**Read Replicas (Followers)** — Copies of the primary that apply replicated changes and serve read queries. Each replica maintains its own buffer pool, connection pool, and query processing resources.","**Query Router / Proxy** — Optional but recommended component that directs queries to appropriate destinations—writes to primary, reads to replicas—transparently from the application's perspective.","**Health Monitor** — System that tracks replica status, detects lag, and removes unhealthy replicas from the read pool to prevent stale data from being served."],"title":{"icon":"Target","text":"Read Replica System Components","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"height":"450px","mermaidSyntax":"\nflowchart TB\n subgraph Applications\n A1[App Server 1]\n A2[App Server 2]\n A3[App Server 3]\n end\n\n subgraph QueryRouting[\"Query Routing Layer\"]\n PR[Proxy / Router]\n end\n\n subgraph DatabaseLayer[\"Database Cluster\"]\n subgraph Primary[\"Primary (Writer)\"]\n PDB[\"(Primary DB)\"]\n WAL[Transaction Log]\n end\n \n subgraph Replicas[\"Read Replicas\"]\n R1[\"(Replica 1)\"]\n R2[\"(Replica 2)\"]\n R3[\"(Replica 3)\"]\n end\n end\n\n A1 --> PR\n A2 --> PR\n A3 --> PR\n \n PR -->|\"Writes\"| PDB\n PR -->|\"Reads\"| R1\n PR -->|\"Reads\"| R2\n PR -->|\"Reads\"| R3\n \n PDB --> WAL\n WAL -->|\"Replication Stream\"| R1\n WAL -->|\"Replication Stream\"| R2\n WAL -->|\"Replication Stream\"| R3\n"},"type":"mermaid-excalidraw"},{"data":{"content":"**Replication mechanics vary by database:**\n\nEach database implements replication differently, but the conceptual model remains consistent across platforms:\n\n**PostgreSQL Streaming Replication:**\n- Primary writes changes to Write-Ahead Log (WAL)\n- WAL sender process transmits WAL records to replicas\n- Replicas apply WAL records to maintain synchronization\n- Supports both synchronous and asynchronous modes\n\n**MySQL Binary Log Replication:**\n- Primary writes changes to binary log (binlog)\n- Replicas connect to primary's binlog dump thread\n- Replica I/O thread pulls binlog events\n- Replica SQL thread applies events to local data\n\n**Cloud-Managed Replication (RDS, Cloud SQL, Azure SQL):**\n- Managed services abstract replication complexity\n- Replicas provisioned through console/API\n- Automatic failover capabilities often included\n- Storage-layer replication for performance (e.g., Aurora)"},"type":"text"}],"titleType":"number","titleNumber":2},{"id":"read-write-splitting","title":"Read/Write Splitting Strategies","content":[{"data":{"content":"The effectiveness of read replicas depends entirely on *how* your application routes queries. Read/write splitting—directing write operations to the primary and read operations to replicas—can be implemented at multiple architectural layers, each with distinct trade-offs.\n\n**Implementation layers from application to infrastructure:**"},"type":"text"},{"data":{"tabs":[{"id":"application-level","badge":"Most Control","label":"Application-Level","content":[{"data":{"content":"**Application-level splitting** places routing logic directly in your codebase. The application explicitly chooses which database connection to use for each query.\n\n**Advantages:**\n- Complete control over routing decisions\n- Can implement complex logic (e.g., read-your-writes consistency)\n- No additional infrastructure components\n- Easy to test and debug\n\n**Disadvantages:**\n- Requires code changes throughout application\n- Risk of incorrect routing (writes sent to replicas)\n- Routing logic duplicated across services\n- Developers must understand replica architecture"},"type":"text"},{"data":{"code":"$72","fileName":"database-router.ts","showLineNumbers":true},"type":"code"}],"titleIcon":"Code2"},{"id":"orm-level","badge":"Balanced","label":"ORM/Framework-Level","content":[{"data":{"content":"**ORM-level splitting** leverages database abstraction layers that many applications already use. Popular ORMs and frameworks provide built-in or plugin-based read/write splitting.\n\n**Advantages:**\n- Minimal code changes—configuration-driven\n- Automatic transaction detection (writes in transactions go to primary)\n- Integrated with existing data access patterns\n- Often includes connection pooling and health checks\n\n**Disadvantages:**\n- Framework-specific implementation\n- May have limitations on routing logic\n- Can obscure database access patterns\n- Debugging requires understanding ORM internals"},"type":"text"},{"data":{"code":"$73","fileName":"prisma-replica-config.ts","showLineNumbers":true},"type":"code"}],"titleIcon":"Lightbulb"},{"id":"proxy-level","badge":"Transparent","label":"Proxy-Level","content":[{"data":{"content":"**Proxy-level splitting** interposes a database proxy between applications and databases. The proxy parses SQL, determines query type, and routes accordingly. Examples include ProxySQL, PgBouncer with extensions, Vitess, and MaxScale.\n\n**Advantages:**\n- Completely transparent to application code\n- Centralized routing logic for all services\n- Advanced features: query caching, connection pooling, load balancing\n- Can be added to existing systems without code changes\n\n**Disadvantages:**\n- Additional infrastructure component to manage\n- Potential single point of failure (requires HA setup)\n- Adds latency (typically 1-5ms)\n- Configuration complexity for advanced routing"},"type":"text"},{"data":{"code":"# ProxySQL configuration for MySQL read/write splitting\n\n# Define hostgroups\nmysql_servers =\n(\n # Hostgroup 0: Primary (writer)\n {\n address = \"mysql-primary.internal\"\n port = 3306\n hostgroup = 0\n max_connections = 100\n },\n # Hostgroup 1: Replicas (readers)\n {\n address = \"mysql-replica-1.internal\"\n port = 3306\n hostgroup = 1\n max_connections = 200\n weight = 100\n },\n {\n address = \"mysql-replica-2.internal\"\n port = 3306\n hostgroup = 1\n max_connections = 200\n weight = 100\n }\n)\n\n# Query routing rules\nmysql_query_rules =\n(\n # Route SELECT queries to replica hostgroup (1)\n {\n rule_id = 1\n match_pattern = \"^SELECT\"\n destination_hostgroup = 1\n apply = 1\n },\n # Route all other queries (INSERT, UPDATE, DELETE) to primary (0)\n {\n rule_id = 2\n match_pattern = \".*\"\n destination_hostgroup = 0\n apply = 1\n }\n)","fileName":"proxysql.cnf","showLineNumbers":true},"type":"code"}],"titleIcon":"Zap"}]},"type":"tabs"},{"data":{"icon":"Lightbulb","title":"Hybrid Approaches","content":"Production systems often combine multiple layers. A proxy handles basic routing and connection pooling, while application code implements nuanced logic for consistency-critical paths. This layered approach provides both transparency for simple cases and control for complex scenarios.","variant":"tip"},"type":"callout"}],"titleType":"number","titleNumber":3},{"id":"traffic-patterns","title":"Traffic Patterns and Workload Analysis","content":[{"data":{"content":"Not all read workloads benefit equally from replication. Understanding your traffic patterns is essential for sizing replica infrastructure and anticipating when replication will—and won't—solve your problems.\n\n**Characterizing read workloads:**\n\nRead queries vary dramatically in their resource consumption and latency tolerance. Effective replica deployment requires classifying your queries along several dimensions:"},"type":"text"},{"data":{"rows":[["Point Lookups","Index seek, single row, <5ms","Excellent","SELECT * FROM users WHERE id = 123"],["Range Scans","Index range, multiple rows, 5-50ms","Excellent","SELECT * FROM orders WHERE user_id = 123"],["Aggregations","Table/index scans, computation, 50-500ms","Good (offloads primary)","SELECT COUNT(*), AVG(total) FROM orders WHERE date > '2024-01-01'"],["Complex Joins","Multi-table, optimization-heavy, 100ms-5s","Good (but lag-sensitive)","SELECT ... FROM orders JOIN products JOIN inventory ..."],["Full-Text Search","Specialized indexes, 50-200ms","Good","SELECT * FROM products WHERE name @@ 'search terms'"],["Analytic Queries","Large scans, heavy aggregation, 1s-minutes","Excellent (dedicated replica)","SELECT date, SUM(revenue) ... GROUP BY date"],["Real-Time Dashboards","Frequent, lightweight, <10ms","Moderate (lag consideration)","SELECT COUNT(*) FROM active_sessions"]],"caption":"Read Query Classification Matrix","headers":["Query Type","Characteristics","Replica Suitability","Example"]},"type":"table"},{"data":{"content":"**Workload patterns that maximize replica value:**"},"type":"text"},{"data":{"left":[{"data":{"items":["**High read-to-write ratio** — 10:1 or higher means reads dominate resource consumption","**Tolerance for slight staleness** — Displaying cached content, historical reports, non-critical reads","**Heavy analytical queries** — Long-running reports that would block OLTP traffic on primary","**Geographically distributed users** — Replicas placed in user regions reduce latency","**Predictable query patterns** — Cacheable, index-friendly queries scale linearly"],"title":{"icon":"CheckCircle","text":"Ideal for Read Replicas","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"}],"right":[{"data":{"items":["**Write-heavy workloads** — Replication overhead dominates; consider sharding instead","**Strict consistency requirements** — Financial transactions, inventory, real-time counters","**Read-after-write requirements** — User expects to immediately see their changes","**Low read volume** — Replica cost outweighs benefit below certain thresholds","**Unpredictable query patterns** — Ad-hoc queries may create hotspots or scan entire tables"],"title":{"icon":"XCircle","text":"Poor Fit for Read Replicas Alone","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"accent"},"type":"list"}]},"type":"two-column"},{"data":{"icon":"Info","title":"Measure Before You Architect","content":"Before deploying replicas, instrument your application to capture actual query patterns. Use database query logs, APM tools, or built-in statistics (pg_stat_statements in PostgreSQL, performance_schema in MySQL) to understand your read/write ratio, query latency distribution, and connection utilization. This data should drive replica sizing and routing strategy.","variant":"note"},"type":"callout"}],"titleType":"number","titleNumber":4},{"id":"scaling-considerations","title":"Scaling Considerations and Capacity Planning","content":[{"data":{"content":"Adding read replicas is not infinitely scalable. Several constraints limit how many replicas you can effectively deploy and how much read capacity you can gain.\n\n**Replication fan-out limits:**\n\nEach replica maintains a connection to the primary and consumes resources on the primary for WAL/binlog transmission. Practical limits include:\n\n- **PostgreSQL:** Typically supports 10-20 streaming replicas before primary overhead becomes significant. Each replica requires a replication slot and WAL sender process.\n\n- **MySQL:** Similar limits, with binlog dump threads consuming resources per replica. MySQL 8.0 improved parallel replication but primary overhead remains.\n\n- **Cloud-managed services:** May have explicit limits (e.g., RDS allows up to 15 read replicas for MySQL/PostgreSQL).\n\n**Scaling strategies beyond direct replication:**"},"type":"text"},{"data":{"items":["**Cascading replicas** — Replicas can replicate from other replicas instead of the primary. This creates a replication tree that reduces primary load but increases lag at lower tiers.","**Read replica pools by function** — Separate replica pools for different workloads: one pool for API reads, another for analytics, another for search indexing. Prevents workload interference.","**Cache layer in front of replicas** — Application-level caching (Redis, Memcached) handles hot-path reads, reducing replica load. Replicas serve cache misses and less frequent queries.","**Materialized views and denormalization** — Pre-computed results stored in dedicated read stores (Elasticsearch for search, ClickHouse for analytics). Reduces query complexity on replicas."],"title":"Advanced Replica Scaling Patterns","variant":"glass"},"type":"list"},{"data":{"content":"**Capacity planning formula:**\n\nA rough capacity model for read replicas:\n\n```\nRequired Replicas = (Peak Concurrent Read Queries × Average Query Time) / (Replica Capacity × Safety Factor)\n```\n\n**Example calculation:**\n- Peak concurrent read queries: 1,000\n- Average query execution time: 50ms (0.05s)\n- Single replica can handle: 500 queries/second\n- Safety factor: 1.5 (headroom for spikes)\n\n```\nRequired = (1000 × 0.05) / (500 × (1/1.5))\nRequired = 50 / 333.33 ≈ 0.15, round up to 2 replicas minimum\n```\n\nAlways add at least one additional replica for redundancy—if one fails, remaining replicas must absorb its traffic."},"type":"text"},{"data":{"icon":"AlertCircle","title":"Replica Elasticity Considerations","content":"Unlike stateless application servers, database replicas cannot be instantly scaled. Creating a new replica requires copying the entire dataset—a process that takes hours for large databases. Plan capacity ahead of demand, and consider maintaining warm standby replicas that can be promoted to active read duty during traffic spikes.","variant":"warning"},"type":"callout"}],"titleType":"number","titleNumber":5},{"id":"implementation-best-practices","title":"Implementation Best Practices","content":[{"data":{"content":"Deploying read replicas effectively requires attention to operational details that determine success or failure in production."},"type":"text"},{"data":{"type":"ordered","items":["**Identical hardware specifications** — Replicas should match primary specifications. Underpowered replicas become bottlenecks and increase lag.","**Separate connection pools** — Use dedicated connection pools for primary and replicas. This prevents connection exhaustion on either tier from affecting the other.","**Health check endpoints** — Implement replica health checks that verify both connectivity AND acceptable lag. Remove lagging replicas from load balancer rotation automatically.","**Query timeout configuration** — Set appropriate query timeouts on replicas. Long-running queries should not block connection pools indefinitely.","**Read-only enforcement** — Configure replicas as explicitly read-only at the database level (e.g., `default_transaction_read_only=on` in PostgreSQL). This prevents accidental writes.","**Monitoring and alerting** — Track replication lag, replica query latency, connection pool utilization, and error rates. Alert before user impact.","**Graceful degradation** — Design the application to fall back to primary reads if all replicas become unavailable. Primary should have headroom for this scenario.","**Testing replica failures** — Regularly test replica failure scenarios in non-production environments. Verify that routing correctly excludes failed replicas."],"title":{"icon":"CheckCircle","text":"Read Replica Implementation Checklist","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"code":"$74","fileName":"health-check-example.ts","showLineNumbers":true},"type":"code"}],"titleType":"number","titleNumber":6},{"id":"summary","title":"Summary: Offloading Read Traffic","content":[{"data":{"content":"We've established the foundational concepts for scaling SQL reads through replica architectures. Let's consolidate the essential takeaways:"},"type":"text"},{"data":{"type":"ordered","items":["**Read replicas solve the read scalability challenge** — By creating synchronized copies of your database, you multiply read capacity while preserving the single-writer consistency model.","**Read/write splitting can be implemented at multiple layers** — Application-level provides maximum control, ORM-level offers convenience, and proxy-level enables transparency. Many systems combine approaches.","**Not all workloads benefit equally** — High read-to-write ratios, tolerance for staleness, and heavy analytical queries are ideal candidates. Write-heavy or consistency-critical workloads require different strategies.","**Capacity planning requires measurement** — Understand your actual query patterns, latency requirements, and connection utilization before sizing replica infrastructure.","**Operational excellence determines success** — Health checks, monitoring, graceful degradation, and failure testing are essential for production reliability."],"title":{"icon":"CheckCircle","text":"Key Takeaways","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"content":"**What's next:**\n\nWith the architectural foundation established, the next page dives into **Replica Lag Handling**—the inherent trade-off of asynchronous replication. We'll explore what lag is, why it occurs, how to measure it, and strategies for building applications that gracefully handle stale reads."},"type":"text"},{"data":{"icon":"CheckCircle","title":"Page Complete","content":"You now understand the fundamental architecture of read replicas and how to offload read traffic from your primary database. The concepts covered here—read/write splitting, traffic pattern analysis, capacity planning, and operational best practices—form the foundation for all subsequent topics in this module.","variant":"success"},"type":"callout"}],"titleType":"number","titleNumber":7}],"isLocked":false},{"id":"seed_e3debe09bbadc5640774d90a9ac3b8f7","title":"Replica Lag Handling","order":1,"content":null,"isLocked":true},{"id":"seed_b11f0901d6beefabd8615a0143b448e7","title":"Load Balancing Reads","order":2,"content":null,"isLocked":true},{"id":"seed_712f8a9b84639c72c5094ec90c24852f","title":"Consistency Considerations","order":3,"content":null,"isLocked":true},{"id":"seed_e01fca4721c9a3369335594e1a753eef","title":"Replica Promotion","order":4,"content":null,"isLocked":true}]}},"dataUpdateCount":1,"dataUpdatedAt":1792199604919,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["learningContent","getModule"],{"input":{"slug":"read-replicas"},"type":"query"}],"queryHash":"[[\"learningContent\",\"getModule\"],{\"input\":{\"slug\":\"read-replicas\"},\"type\":\"query\"}]"},{"dehydratedAt":1792199604952,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792199604920,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["learningContent","getProgress"],{"input":{"moduleId":"seed_19ee82b443d0e88293e96f7cb057a425"},"type":"query"}],"queryHash":"[[\"learningContent\",\"getProgress\"],{\"input\":{\"moduleId\":\"seed_19ee82b443d0e88293e96f7cb057a425\"},\"type\":\"query\"}]"},{"dehydratedAt":1792199604952,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792199604920,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["feedback","get"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_e01fca4721c9a3369335594e1a753eef"},"type":"query"}],"queryHash":"[[\"feedback\",\"get\"],{\"input\":{\"contentId\":\"seed_e01fca4721c9a3369335594e1a753eef\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792199604952,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792199604920,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["feedback","getUserLike"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_e01fca4721c9a3369335594e1a753eef"},"type":"query"}],"queryHash":"[[\"feedback\",\"getUserLike\"],{\"input\":{\"contentId\":\"seed_e01fca4721c9a3369335594e1a753eef\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792199604952,"state":{"data":{"json":[]},"dataUpdateCount":1,"dataUpdatedAt":1792199604920,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["highlights","getHighlights"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_e01fca4721c9a3369335594e1a753eef"},"type":"query"}],"queryHash":"[[\"highlights\",\"getHighlights\"],{\"input\":{\"contentId\":\"seed_e01fca4721c9a3369335594e1a753eef\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792199604952,"state":{"data":"$undefined","dataUpdateCount":0,"dataUpdatedAt":0,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"pending","fetchStatus":"fetching"},"queryKey":[["highlights","getPopularHighlights"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_e01fca4721c9a3369335594e1a753eef","minCount":2},"type":"query"}],"queryHash":"[[\"highlights\",\"getPopularHighlights\"],{\"input\":{\"contentId\":\"seed_e01fca4721c9a3369335594e1a753eef\",\"contentType\":\"LEARNING_PAGE\",\"minCount\":2},\"type\":\"query\"}]","promise":"$@75"}]},"children":"$L76"}]