Changeset 0.28.0 (#172)

server/database/migrations/008_memory.sql

@@ -2,7 +2,7 @@
 -- Chat Switchboard — 008 Memory
 -- ==========================================
 -- Long-term memory across conversations, extraction tracking.
--- ICD §9 (Memory)
+-- Consolidated v0.28.0: adds last_compacted_at + decay_rate.
 -- ==========================================
 
 -- =========================================
@@ -21,6 +21,11 @@ CREATE TABLE IF NOT EXISTS memories (
     status            TEXT NOT NULL DEFAULT 'active'
                       CHECK (status IN ('active', 'pending_review', 'archived')),
     embedding         vector(3072),
+
+    -- Compaction support (v0.28.0)
+    last_compacted_at TIMESTAMPTZ,
+    decay_rate        REAL NOT NULL DEFAULT 0.0,
+
     created_at        TIMESTAMPTZ DEFAULT now(),
     updated_at        TIMESTAMPTZ DEFAULT now()
 );
@@ -47,6 +52,8 @@ COMMENT ON TABLE memories IS 'Long-term memory facts persisted across conversati
 COMMENT ON COLUMN memories.scope IS 'user = personal facts; persona = shared; persona_user = per-user within a persona';
 COMMENT ON COLUMN memories.owner_id IS 'user_id for user scope, persona_id for persona/persona_user scopes';
 COMMENT ON COLUMN memories.confidence IS '0.0-1.0 confidence score — higher = more certain';
+COMMENT ON COLUMN memories.last_compacted_at IS 'Last time this memory was evaluated by the compaction process';
+COMMENT ON COLUMN memories.decay_rate IS 'Rate at which confidence decreases over time (0.0 = no decay)';
 
 CREATE OR REPLACE FUNCTION update_memories_updated_at()
 RETURNS TRIGGER AS $$
@@ -63,7 +70,7 @@ CREATE TRIGGER trg_memories_updated_at
 
 
 -- =========================================
--- MEMORY EXTRACTION LOG (v0.18.0 Phase 2)
+-- MEMORY EXTRACTION LOG
 -- =========================================
 
 CREATE TABLE IF NOT EXISTS memory_extraction_log (