I replaced my entire stack with Postgres...

PostgreSQL can replace a surprising number of specialized services in a typical tech stack. JSONB with GIN indexes handles NoSQL-style document storage, SELECT FOR UPDATE SKIP LOCKED turns a table into a concurrent job queue, tsvector/tsquery plus pg_trgm power full-text and fuzzy search, and the pgvector extension with HNSW indexes enables vector similarity search alongside relational data. PostGIS covers geospatial queries, declarative partitioning with BRIN indexes handles time-series workloads, materialized views replace basic data warehouse dashboards, and tools like PostgREST or pg_graphql auto-generate APIs directly from the schema. The post acknowledges limits: horizontal sharding at extreme scale and sub-millisecond in-memory caching still warrant specialized tools, but for most applications PostgreSQL alone is a cost-effective, battle-tested foundation.