diff --git a/config/default.yml b/config/default.yml
index 1545deb..86816db 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -103,7 +103,7 @@ save:
 # tar1090-node configuration
 # Note: tar1090 uses location.rx for receiver position (no separate tar1090.location needed)
 tar1090:
-  adsb_source: "192.168.8.183,30005,beast_in"  # External ADS-B feed (IP,PORT,PROTOCOL)
+  adsb_source: ""  # Optional local ADS-B receiver (IP,PORT,PROTOCOL). Empty = rely on adsblol_fallback.
   adsblol_fallback: true
   adsblol_radius: 40
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 9240bb2..13201e0 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -124,7 +124,16 @@ services:
       - RECEIVER_LON=${RECEIVER_LON:-0}
       - ADSBLOL_RADIUS=${ADSBLOL_RADIUS:-40}
       - PROXY_PORT=3005
+      # SD-card endurance: run the graphs1090 RRD set from the /run tmpfs below
+      # and write it back as a single gzipped tarball, instead of 48 scattered
+      # in-place RRD updates every 60s. Only effective because /run is tmpfs.
+      - GRAPHS1090_REDUCE_IO=true
     tmpfs:
+      # /run holds volatile runtime state (readsb JSON at 1 Hz, tar1090 chunks,
+      # graphs1090 PNGs, s6 service dirs) and is tmpfs on any normal install.
+      # On the container overlay it cost ~7 GB/day of SD-card writes for ~8 KB/min
+      # of real data. exec is required: s6-overlay execs its service scripts here.
+      - /run:exec,size=64M
       - /var/log:size=32M
 
   adsb2dd:
diff --git a/staging/docker-compose.staging.yml b/staging/docker-compose.staging.yml
index 28adf9a..42f97ad 100644
--- a/staging/docker-compose.staging.yml
+++ b/staging/docker-compose.staging.yml
@@ -111,7 +111,16 @@ services:
       - RECEIVER_LON=${RECEIVER_LON:--84.65191}
       - ADSBLOL_RADIUS=${ADSBLOL_RADIUS:-40}
       - PROXY_PORT=3005
+      # SD-card endurance: run the graphs1090 RRD set from the /run tmpfs below
+      # and write it back as a single gzipped tarball, instead of 48 scattered
+      # in-place RRD updates every 60s. Only effective because /run is tmpfs.
+      - GRAPHS1090_REDUCE_IO=true
     tmpfs:
+      # /run holds volatile runtime state (readsb JSON at 1 Hz, tar1090 chunks,
+      # graphs1090 PNGs, s6 service dirs) and is tmpfs on any normal install.
+      # On the container overlay it cost ~7 GB/day of SD-card writes for ~8 KB/min
+      # of real data. exec is required: s6-overlay execs its service scripts here.
+      - /run:exec,size=64M
       - /var/log:size=32M
 
   adsb2dd: