DBRavenArchitecture Decision Reports

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Architecture Structural Diff

Compare two scenarios node-by-node. See exactly which components, failure modes, and connections are shared, removed (−), or added (+) when switching from the left scenario to the right.

Select Scenarios to Diff

left, removals (−)

AI Retrieval-Augmented Generation Platform

AI / RAG

API Gateway Platform

Multi-Tenant SaaS

Analytics Data Platform

Analytics

Audit and Compliance Platform

Financial Ledger

Content Management Platform

Read-Heavy

Developer Tools Platform

Multi-Tenant SaaS

Distributed Job Queue Platform

Write-Heavy

E-Commerce Order Platform

Marketplace

Event-Driven Analytics Pipeline

Event-Driven

Financial Ledger Platform

Financial Ledger

Gaming Backend Platform

Realtime Collab

Geospatial Tracking Platform

Realtime Collab

Healthcare Records Platform

Financial Ledger

IoT Telemetry Ingestion Platform

Write-Heavy

ML Feature Serving Platform

AI / RAG

Multi-Tenant SaaS Platform

Multi-Tenant SaaS

Notification Delivery Platform

Event-Driven

Observability Platform

Analytics

Read-Heavy SaaS API

Read-Heavy

Realtime Collaborative Editor

Realtime Collab

Search-Heavy Content Platform

Social Feed Platform

Event-Driven

Streaming Media Platform

Event-Driven

Two-Sided Marketplace Platform

Marketplace

Write-Heavy Transactional Platform

Write-Heavy

right, removals (−)

AI Retrieval-Augmented Generation Platform

AI / RAG

API Gateway Platform

Multi-Tenant SaaS

Analytics Data Platform

Analytics

Audit and Compliance Platform

Financial Ledger

Content Management Platform

Read-Heavy

Developer Tools Platform

Multi-Tenant SaaS

Distributed Job Queue Platform

Write-Heavy

E-Commerce Order Platform

Marketplace

Event-Driven Analytics Pipeline

Event-Driven

Financial Ledger Platform

Gaming Backend Platform

Realtime Collab

Geospatial Tracking Platform

Realtime Collab

Healthcare Records Platform

Financial Ledger

IoT Telemetry Ingestion Platform

Write-Heavy

ML Feature Serving Platform

AI / RAG

Multi-Tenant SaaS Platform

Multi-Tenant SaaS

Notification Delivery Platform

Event-Driven

Observability Platform

Analytics

Read-Heavy SaaS API

Read-Heavy

Realtime Collaborative Editor

Realtime Collab

Search-Heavy Content Platform

Search-Heavy

Social Feed Platform

Event-Driven

Streaming Media Platform

Event-Driven

Two-Sided Marketplace Platform

Marketplace

Write-Heavy Transactional Platform

Write-Heavy

Financial Ledger Platform→Search-Heavy Content Platform

−14 removed+15 added2 unchanged

Components

12

Financial Ledger Platform

13

Search-Heavy Content Platform

2 shared−10+11

Failure Modes

4

Financial Ledger Platform

4

Search-Heavy Content Platform

0 shared−4+4

Connections

9

Financial Ledger Platform

6

Search-Heavy Content Platform

0 shared−9+6

Components

2 shared−10 left only+11 right only

=

PostgreSQLprimary datastore

data management

=

CQRS (Command Query Responsibility Segregation)architecture pattern

application logic

−

Financial Transactionworkload

workload

−

Write-Heavy Transactionalworkload

workload

−

Apache Kafkaevent stream

async processing

−

Event Sourcingarchitecture pattern

application logic

−

Transactional Outbox Patternarchitecture pattern

application logic

−

Two-Phase Commit (2PC)architecture pattern

application logic

−

Lock Contentionoperational risk

operational risk

−

Split-Brainoperational risk

operational risk

−

Write Amplification Cascadeoperational risk

operational risk

−

Schema Migration Lockoperational risk

operational risk

+

Search Heavyworkload

workload

+

Read-Heavy API Backendworkload

workload

+

Elasticsearchsupporting component

application logic

+

Rediscache

acceleration

+

Change Data Capture via WALarchitecture pattern

application logic

+

Cache-Asidearchitecture pattern

application logic

+

Materialized Viewarchitecture pattern

application logic

+

Table and Index Bloatoperational risk

operational risk

+

Hot Partitionoperational risk

operational risk

+

Replication Lag Cascadeoperational risk

operational risk

+

Thundering Herd (Cache Stampede)operational risk

operational risk

Failure Modes

−4 left only+4 right only

−

Lock Contention1 nodes affected

highhigh

−

Split-Brain1 nodes affected

highhigh

−

Write Amplification Cascade0 nodes affected

highhigh

−

Schema Migration Lock0 nodes affected

highhigh

+

Table and Index Bloat0 nodes affected

moderate

+

Hot Partition0 nodes affected

highhigh

+

Replication Lag Cascade0 nodes affected

moderate

+

Thundering Herd (Cache Stampede)1 nodes affected

highhigh

Connections

−9 left only+6 right only

−

Financial transaction workloads benefit from event sourcing because the event log provides an immutable audit trail, enables temporal queries (balance at any past date), and makes the derivation of current state fully traceable: meeting regulatory requirements that state-mutation databases cannot satisfy.

benefits from

−

PostgreSQL serves as a capable event store for moderate event volumes, leveraging JSONB payloads, UNIQUE constraints for optimistic concurrency, and WAL-based replication as a natural CDC feed for downstream projections.

supports

−

Kafka's durable, ordered, append-only log is the canonical infrastructure for an event store at scale. Topics with compaction or retention policies serve as the persistent event log that event sourcing requires.

supports

−

Event sourcing naturally produces a normalized write model (the event log) that CQRS separates from purpose-built read models (projections). Each pattern addresses what the other lacks: event sourcing provides audit and temporal query; CQRS provides fast reads without replay cost.

complements

−

The outbox pattern eliminates split-brain between a database write and a message broker publish by writing both the domain record and the outbox event in a single ACID transaction, ensuring events are published if and only if the database write committed.

mitigates

−

Write-heavy transactional workloads that emit downstream events (order placed, payment captured) benefit from the outbox pattern to ensure events are published exactly when the database transaction commits: never before, never after.

benefits from

−

Two-phase commit's coordinator is a single point of failure. If the coordinator crashes after sending the prepare phase but before completing the commit phase, participants are left in an uncertain state: some may have committed and some not, creating a split-brain condition that requires manual operator intervention.

introduces riskrisk path

−

Schema migrations on write-heavy transactional tables acquire aggressive locks (AccessExclusiveLock) that block all reads and writes. On a high-traffic table receiving 5,000 writes/second, a migration lock that waits even 1 second queues 5,000 transactions behind it, causing a connection pool exhaustion cascade.

introduces riskrisk path

−

Write-heavy transactional workloads amplify lock contention: many concurrent writers contend for row-level locks on the same records (e.g., shared account balances, inventory counts), causing transactions to queue, latency to spike, and throughput to plateau well below hardware limits.

vulnerable torisk path

+

Redis caching absorbs repeated read requests at the edge, reducing database load and latency for high read-to-write ratio workloads by orders of magnitude.

mitigates

+

Read-heavy APIs benefit directly from Redis as a caching tier that absorbs repeated identical reads and provides sub-millisecond response times for hot data, reducing both latency and database load.

benefits from

+

Redis distributed locks (via SET NX EX or Redlock) prevent thundering herd by ensuring only one caller repopulates a cache entry at a time, with other callers either waiting or returning a stale value until the cache is warm.

mitigates

+

Search-heavy workloads cache popular queries and their result sets, absorbing the majority of search traffic from cache and reserving Elasticsearch or other search backends for uncached or freshness-sensitive queries.

benefits from

+

CQRS separates the write model (normalized, ACID) from the read model; materialized views implement the read model by pre-computing the denormalized view that the query side serves. Each pattern makes the other more operationally tractable.

complements

+

Redis is itself vulnerable to thundering herd when it restarts or flushes: all cache entries expire simultaneously, and many concurrent requests all miss and race to repopulate the same keys from the database, causing a stampede that can overwhelm the downstream database.

vulnerable torisk path

Six-Dimension Assessment

Structural comparison across complexity, risk, scalability, maturity, observability, and generator readiness.

expert complexity, 12 nodes, 9 edges, 4 risks, 2 simulation seeds

Complexity

Search-Heavy →

high complexity, 13 nodes, 6 edges, 4 risks, 1 simulation seeds

4 risks (top: high), 4 high/critical, 0 confirmed by simulation

Operational Risk

Search-Heavy →

4 risks (top: high), 2 high/critical, 0 confirmed by simulation

4 scaling thresholds, 3 migration paths, 4 advisor scaling signals

Scalability

depends

4 scaling thresholds, 3 migration paths, 4 advisor scaling signals

Advisor assessment: Advanced; recommended team: Platform Engineering Team; 7 operational requirements

Operational Maturity

Search-Heavy →

Advisor assessment: Intermediate; recommended team: Experienced Backend Team; 9 operational requirements

4 watched metrics, 5 observability recommendations, 2 simulation seeds

Observability

Search-Heavy →

2 watched metrics, 3 observability recommendations, 1 simulation seeds

generator relevance documented; topology generation relevance noted; simulation relevance noted; 2 seeds with generator notes

Generator Readiness

depends

generator relevance documented; topology generation relevance noted; simulation relevance noted; 1 seeds with generator notes

Full comparison + decision path →Topology: Financial Ledger Platform →Topology: Search-Heavy Content Platform →