Flip fallback coverage model: each host defines its own recovery profile

Previously HOST1 defined what it would run for HOST2 (FALLBACK_HOST1_COVERS_HOST2_TIER*).
Now each host defines what it wants run when IT goes down (FALLBACK_HOST1_TIER*), and the
covering server reads the down host's conf via the RAM/persistent cache.

get_tier_containers() reads FALLBACK_${REMOTE_ID}_TIER* instead of
FALLBACK_${MY_ID}_COVERS_${REMOTE_ID}_TIER*. Tier data migrated to the correct host confs.
Writeback paths and delays were already REMOTE_ID-based — no change needed there.

Deployment/host.conf.template

@@ -40,8 +40,8 @@
 #   ── FALLBACK ───────────────────────────────────────────────────────────────────────────────
 #   DDNS                    DDNS containers managed by this host
 #   INTERNET LOSS           containers stopped when internet is lost
-#   FALLBACK TIERS          what this host runs for the remote per tier
-#   TIER DELAYS             delays before each tier activates
+#   FALLBACK TIERS          what this host wants the partner to run when this host is down
+#   TIER DELAYS             how long this host must be down before each tier activates
 #   RSYNC WRITEBACK         appdata synced back on handback
 #
 #   ── DOCKER ─────────────────────────────────────────────────────────────────────────────────
@@ -255,27 +255,27 @@
         # "MyServer.com"
     )
 
-# ━━━ Fallback Tiers — HOSTN Runs for Partner ━━━
-# Containers this host starts when the partner goes down.
-# Replace REMOTE_ID below with the actual remote host ID (HOST1, HOST2, etc.)
-    FALLBACK_HOSTN_COVERS_REMOTE_ID_TIER1=(
-        # "Partner-DDNS-Container"
+# ━━━ Fallback Tiers — What HOSTN Wants Covered When Down ━━━
+# Containers the partner starts for HOSTN when HOSTN goes down.
+# Tier 1 is always immediate. Higher tiers activate after HOSTN_TIER*_DELAY minutes.
+    FALLBACK_HOSTN_TIER1=(
+        # "MyServer-DDNS-Container"
     )
 
-    FALLBACK_HOSTN_COVERS_REMOTE_ID_TIER2=(
+    FALLBACK_HOSTN_TIER2=(
         # "container-placeholder"
     )
 
-    FALLBACK_HOSTN_COVERS_REMOTE_ID_TIER3=(
+    FALLBACK_HOSTN_TIER3=(
         # "container-placeholder"
     )
 
-    FALLBACK_HOSTN_COVERS_REMOTE_ID_TIER4=(
+    FALLBACK_HOSTN_TIER4=(
         # "container-placeholder"
     )
 
-# ━━━ Tier Delays — This Host's Outage Timers ━━━
-# How long THIS host must be down before each tier activates on the partner.
+# ━━━ Tier Delays — HOSTN Outage Timers ━━━
+# How long HOSTN must be down before each tier activates on the partner.
     HOSTN_TIER2_DELAY=240           # 4 hours
     HOSTN_TIER3_DELAY=720           # 12 hours
     HOSTN_TIER4_DELAY=1440          # 24 hours

Fallback/fallback.sh

@@ -75,10 +75,10 @@
 #   failed handback: containers stop on the covering server, remote goes down
 #   again mid-rsync. Strikes prevent this.
 #
-# MY_ID-Based Routing
-#   All tier arrays, DDNS lists, and writeback paths are selected via MY_ID
-#   set by detect_hosts() — not hostname string comparison. The same script
-#   and same config file handle both directions symmetrically.
+# REMOTE_ID-Based Coverage Config
+#   Tier arrays, writeback paths, and delays are all defined in the covered
+#   host's own conf and read via REMOTE_ID — not MY_ID. Each host owns its
+#   complete recovery profile. The same script handles both directions.
 #
 # ==============================================================================================
 # OPERATIONAL SAFEGUARDS
@@ -150,9 +150,10 @@
 #   FALLBACK_HOST*_STOP_ON_NO_NET
 #       Containers stopped when this host loses internet
 #
-#   FALLBACK_HOST*_COVERS_HOST*_TIER1–4
-#       Containers this host starts for the remote when remote is down, by tier.
-#       Variable pattern: FALLBACK_${MY_ID}_COVERS_${REMOTE_ID}_TIER${N}
+#   FALLBACK_HOST*_TIER1–4
+#       Containers started on this host when the partner is down — defined in the
+#       partner's own conf (what the partner wants covered). Read via REMOTE_ID.
+#       Variable pattern: FALLBACK_${REMOTE_ID}_TIER${N}
 #
 #   HOST*_TIER2_DELAY / TIER3_DELAY / TIER4_DELAY
 #       Minutes after FALLBACK entry before activating each tier.
@@ -537,8 +538,7 @@ remote_ddns_stop() {
 
 get_tier_containers() {
     local tier="$1"
-    local remote_id="${REMOTE_ID}"
-    local var_name="FALLBACK_${MY_ID}_COVERS_${remote_id}_TIER${tier}"
+    local var_name="FALLBACK_${REMOTE_ID}_TIER${tier}"
     eval "echo \"\${${var_name}[@]:-}\""
 }
 

Plugin/unraid/include/fallback.php

@@ -67,11 +67,10 @@ function vv_fb_remote_running(string $ip, string $sshKey): array {
 // ── Covers — what a node runs for the other when it's down ───────────────────
 
 function vv_fb_covers(string $covering, string $remote, string $coveringRaw, string $remoteRaw): array {
-    $cu = strtoupper($covering); // HOST1
-    $ru = strtoupper($remote);   // HOST2
+    $ru = strtoupper($remote);   // HOST2 — covered host owns its own tier lists
     $tiers = [];
     for ($t = 1; $t <= 4; $t++) {
-        $tiers["tier$t"] = vv_fb_bash_array($coveringRaw, "FALLBACK_{$cu}_COVERS_{$ru}_TIER{$t}");
+        $tiers["tier$t"] = vv_fb_bash_array($remoteRaw, "FALLBACK_{$ru}_TIER{$t}");
     }
     // Delays: how long the remote (covered) host must be down before each tier fires.
     // Stored in the *remote* host's conf as REMOTE_TIER*_DELAY.