infra: drop redis container — RedisService was unused (HOL-22)

infra/docker/.env.example

@@ -24,7 +24,6 @@ KAFKA_IMAGE_NAME=confluentinc/cp-kafka:7.7.0
 POSTGRES_IMAGE_NAME=ankane/pgvector:v0.5.1
 # OTEL collector image vars removed — HOL-21 dropped the collector container.
 # Backend hosts the OTLP receiver at /otel/v1/{logs,traces,metrics}.
-REDIS_IMAGE_NAME=redis:8.0.2
 ZOOKEEPER_IMAGE_NAME=confluentinc/cp-zookeeper:7.7.0
 
 # ── ClickHouse (analytics) ──────────────────────────────────────────
@@ -45,7 +44,7 @@ KAFKA_SERVERS=kafka:9092
 KAFKA_TOPIC=dev
 
 # ── Redis ───────────────────────────────────────────────────────────
-REDIS_PASSWORD=redispassword
+# Removed in HOL-22 — backend uses IMemoryCache + Postgres instead.
 
 # ── Frontend / API URLs ─────────────────────────────────────────────
 REACT_APP_DISABLE_ANALYTICS=false

infra/docker/compose.hobby-dotnet.yml

@@ -21,7 +21,6 @@ services:
             - ClickHouse__Password=${CLICKHOUSE_PASSWORD:-}
             - ClickHouse__Migrations__Path=/app/clickhouse-migrations
             - ClickHouse__Migrations__Disabled=${CLICKHOUSE_MIGRATIONS_DISABLED:-false}
-            - Redis__Configuration=${REDIS_ADDRESS:-redis:6379}
             - Kafka__BootstrapServers=${KAFKA_SERVERS:-kafka:9092}
             - Storage__Type=filesystem
             - Storage__FilesystemRoot=/highlight-data

infra/docker/compose.yml

@@ -41,21 +41,9 @@ services:
             KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1
             KAFKA_ZOOKEEPER_CONNECT: 'zookeeper:2181'
 
-    redis:
-        logging: *local-logging
-        container_name: redis
-        image: ${REDIS_IMAGE_NAME}
-        restart: on-failure
-        environment:
-            REDIS_PASSWORD: ${REDIS_PASSWORD}
-        volumes:
-            - redis-data:/data
-        ports:
-            - '0.0.0.0:6379:6379'
-        command:
-            - redis-server
-            - --save 60 1
-            - --loglevel warning
+    # Redis removed in HOL-22 — RedisService was registered in DI but no
+    # code path actually injected it. Self-hosted scale doesn't need a
+    # separate cache layer; .NET's IMemoryCache + Postgres cover it.
 
     postgres:
         logging: *local-logging
@@ -100,7 +88,6 @@ volumes:
     postgres-data:
     clickhouse-data:
     clickhouse-logs:
-    redis-data:
     kafka-data:
     zoo-log:
     zoo-data:

infra/docker/env.sh

@@ -33,7 +33,6 @@ if [[ "$*" == *"--go-docker"* ]]; then
     export OTLP_DOGFOOD_ENDPOINT=http://backend:8082/otel
     export OTLP_ENDPOINT=http://backend:8082/otel
     export PSQL_HOST=postgres
-    export REDIS_EVENTS_STAGING_ENDPOINT=redis:6379
     echo "Using docker-internal infra."
 else
     export CLICKHOUSE_ADDRESS=localhost:9000
@@ -42,7 +41,6 @@ else
     export OTLP_DOGFOOD_ENDPOINT=http://localhost:8082/otel
     export OTLP_ENDPOINT=http://localhost:8082/otel
     export PSQL_HOST=localhost
-    export REDIS_EVENTS_STAGING_ENDPOINT=localhost:6379
 fi
 
 # setup path to include go installed binaries

src/dotnet/src/HoldFast.Api/Program.cs

@@ -12,7 +12,6 @@
 using HoldFast.Shared.Kafka;
 using HoldFast.Shared.Runtime;
 using HoldFast.Shared.SessionProcessing;
-using HoldFast.Shared.Redis;
 using HoldFast.Storage;
 using HoldFast.Worker;
 using Microsoft.EntityFrameworkCore;
@@ -152,11 +151,6 @@ req.RequestUri is null ||
     builder.Configuration.GetSection("Kafka:TopicBootstrap"));
 builder.Services.AddHostedService<KafkaTopicBootstrapService>();
 
-// ── Redis ─────────────────────────────────────────────────────────────
-builder.Services.Configure<RedisOptions>(
-    builder.Configuration.GetSection("Redis"));
-builder.Services.AddSingleton<RedisService>();
-
 // ── ClickHouse ────────────────────────────────────────────────────────
 builder.Services.Configure<ClickHouseOptions>(
     builder.Configuration.GetSection("ClickHouse"));

src/dotnet/src/HoldFast.Shared/HoldFast.Shared.csproj

@@ -11,7 +11,6 @@
     <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.3" />
     <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.15.2" />
     <PackageReference Include="Serilog.AspNetCore" Version="10.0.0" />
-    <PackageReference Include="StackExchange.Redis" Version="2.12.4" />
   </ItemGroup>
 
   <ItemGroup>