Ollama: keep loaded models resident until evicted (KEEP_ALIVE=-1)

Was 30m, which evicts after 30 minutes of inactivity and forces a
reload penalty on the next request. Setting -1 holds models in VRAM
indefinitely; MAX_LOADED_MODELS=3 caps how many can stay resident
simultaneously (vs the previous 2). Tune MAX higher if you're
rotating between more than three models AND your GPU has the VRAM
for it — comment in the compose explains the trade-off.

For the live srvno.de stack: OLLAMA_KEEP_ALIVE=-1 takes effect on
the next `docker compose up -d ollama`. Loaded models survive the
restart only if they're re-requested before swap-out anyway.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

deployments/ai-stack/docker-compose.yml

@@ -60,8 +60,12 @@ services:
       - ollama-data:/root/.ollama
     environment:
       - OLLAMA_HOST=0.0.0.0:11434
-      - OLLAMA_KEEP_ALIVE=30m
-      - OLLAMA_MAX_LOADED_MODELS=2
+      # KEEP_ALIVE=-1 holds loaded models in VRAM until evicted by another
+      # load (vs the default 5m / our previous 30m which forces a reload
+      # penalty on every cold use). Pair with MAX_LOADED_MODELS sized to
+      # whatever fits in your GPU's VRAM — see README "VRAM sizing".
+      - OLLAMA_KEEP_ALIVE=-1
+      - OLLAMA_MAX_LOADED_MODELS=3
       - OLLAMA_FLASH_ATTENTION=1
     deploy:
       resources: