feat(memory): implement tier decay, importance evaluation, and reinforced ranking

data/schemas/20260707000000_memory_tier_decay.up.sql

@@ -0,0 +1,5 @@
+ALTER TABLE convo_memory ADD COLUMN IF NOT EXISTS tier text NOT NULL DEFAULT 'working';
+ALTER TABLE convo_memory ADD COLUMN IF NOT EXISTS importance_score float NOT NULL DEFAULT 0.5;
+ALTER TABLE convo_memory ADD COLUMN IF NOT EXISTS last_accessed_at timestamptz NOT NULL DEFAULT now();
+ALTER TABLE convo_memory ADD COLUMN IF NOT EXISTS access_count int NOT NULL DEFAULT 0;
+ALTER TABLE convo_memory ADD COLUMN IF NOT EXISTS decay_rate float NOT NULL DEFAULT 1.0;

docs/convo.yaml

@@ -2,6 +2,7 @@
 depends:
   comm: 'github.com/cupogo/andvari/models/comm'
   oid: 'github.com/cupogo/andvari/models/oid'
+  time: 'time'
 
 enums:
 
@@ -226,6 +227,32 @@ models:
         type: string
         tags: {json: 'content', pg: ',notnull,type:text'}
         isset: true
+      - comment: 分层  (working/short-term/long-term)
+        name: Tier
+        type: string
+        tags: {json: 'tier', pg: ',notnull,type:text,default:working'}
+        isset: true
+        query: 'match'
+      - comment: 重要性评分  (0-1)
+        name: ImportanceScore
+        type: float64
+        tags: {json: 'importanceScore', pg: 'importance_score,notnull,type:float,default:0.5'}
+        isset: true
+      - comment: 最近访问时间
+        name: LastAccessedAt
+        type: "time.Time"
+        tags: {json: 'lastAccessedAt', pg: 'last_accessed_at,notnull,type:timestamptz,default:now()'}
+        isset: true
+      - comment: 访问计数
+        name: AccessCount
+        type: int
+        tags: {json: 'accessCount', pg: 'access_count,notnull,type:int,default:0'}
+        isset: true
+      - comment: 衰减率
+        name: DecayRate
+        type: float64
+        tags: {json: 'decayRate', pg: 'decay_rate,notnull,type:float,default:1.0'}
+        isset: true
       - type: comm.MetaField
     oidcat: event
     specNs: convo