memory-manager

name	memory-manager
description	Persistent project memory using SQLite + FTS5 + BM25. Fast, zero dependencies (stdlib only), production-ready. Progressive disclosure with 3 layers (compact/index/detailed).
version	2.0.0
author	forgewright
tags	["memory","sqlite","fts5","persistence","knowledge-base","context"]

Memory Manager Skill

Identity: The long-term memory for AI agents. Every decision, blocker, and lesson is preserved across sessions — so context isn't lost when models reset.

Critical Rules

Rule	Why It Matters
Store AFTER each task	If you don't save it, it's lost when context resets. Memory is only useful if it's populated.
Query BEFORE starting work	Don't re-derive context. Query memory first — the answer may already exist.
Redact secrets automatically	Never store API keys, passwords, or tokens. Auto-redaction prevents credential leaks.
Layer your retrieval	L1 (compact) first for overview, L2 (search) for details, L3 (full) on-demand.

---

Architecture

System Design

┌─────────────────────────────────────────────────────────────────┐
│                     MEMORY SYSTEM ARCHITECTURE                     │
├─────────────────────────────────────────────────────────────────┤
│                                                                  │
│  ┌──────────────┐     ┌──────────────────┐     ┌───────────┐  │
│  │   CLI/API    │ ──▶ │   MemoryDB       │ ──▶ │  SQLite   │  │
│  │  (mem0-v2)  │     │   (Python)       │     │  + FTS5   │  │
│  └──────────────┘     └──────────────────┘     └───────────┘  │
│         │                      │                       │         │
│         │              ┌──────┴───────┐                │         │
│         │              │              │                │         │
│         ▼              ▼              ▼                ▼         │
│  ┌────────────┐  ┌───────────┐  ┌───────────┐  ┌──────────┐   │
│  │   add()    │  │  search() │  │   list()  │  │   gc()   │   │
│  │  store obs │  │  BM25 FTS │  │by category│  │ clean up │   │
│  └────────────┘  └───────────┘  └───────────┘  └──────────┘   │
│                                                                  │
│  ┌────────────────────────────────────────────────────────────┐  │
│  │                  TOKEN BUDGET OPTIMIZATION                 │  │
│  │                                                              │  │
│  │  L1 Index: ~15 tokens/result (overview)                    │  │
│  │  L2 Search: ~60 tokens/result (BM25 ranked)              │  │
│  │  L3 Full: ~200 tokens/result (complete detail)            │  │
│  │                                                              │  │
│  │  Max injection: 500 tokens (configurable)                  │  │
│  └────────────────────────────────────────────────────────────┘  │
└─────────────────────────────────────────────────────────────────┘

Technology Stack

Component	Technology	Why
Database	SQLite + FTS5	WAL mode, crash-safe, concurrent reads, full-text search
Search	BM25 ranking (FTS5)	Production-grade relevance scoring
Token Optimization	3-layer progressive disclosure	75% token reduction vs naive approach
Dependencies	Zero (stdlib only)	No API key, no pip install, no external service

---

When to Use Memory

Step 0.5 — Memory Retrieval (MANDATORY on every request)

┌─────────────────────────────────────────────────────────────────────┐
│ Step 0.5 — MEMORY RETRIEVAL (MANDATORY)                          │
├─────────────────────────────────────────────────────────────────────┤
│  Run BEFORE interpreting the user's request:                       │
│                                                                      │
│  1. Extract keywords from the user's request (nouns, verbs)        │
│  2. Run: bash scripts/memory-retrieve.sh "<request>"              │
│     OR:  python3 scripts/mem0-v2.py search "<keywords>" --limit 3│
│  3. Also run: bash scripts/memory-suggest.sh "<request>"        │
│  3. If relevant memories found:                                    │
│     → Inject as MEMORY BLOCK at top of context                   │
│     → Note: "Found N relevant memories from previous sessions"     │
│  4. Also load:                                                    │
│     - .forgewright/subagent-context/CONVERSATION_SUMMARY.md        │
│     - .forgewright/memory-bank/activeContext.md                    │
│     - .forgewright/business-analyst/handoff/ba-package.md (if exists)│
│  5. Log: "✓ Memory retrieval done — N memories loaded"           │
│                                                                      │
│  Max tokens: 500 (configurable via MEM0_MAX_TOKENS)             │
└─────────────────────────────────────────────────────────────────────┘

Evidence-first note: Every assumption about project history should be verified against mem0 before acting. If mem0 has a memory about a previous decision, cite it. If it contradicts the assumption, update the assumption.

Session Lifecycle Hooks

Hook	Trigger	Action
SESSION_START	Pipeline begins	Run Step 0.5 — search project context + request keywords
TURN_CLOSE	After every user request	Store request/done/open summary
PHASE_COMPLETE	After DEFINE/BUILD/HARDEN/SHIP	Store phase completion summary
GATE_DECISION	After Gate 1/2/3	Store gate decision and feedback
SESSION_END	Pipeline completes	Store final session summary
ERROR	Task failure	Store blocker details

Query Patterns

Situation	Query Approach
Start new session	search "<project-name> recent"
Before complex task	search "<task-keywords>"
Finding decisions	list --category decisions --limit 10
Checking blockers	list --category blockers --limit 5
Getting project context	index "<project-name>" --limit 30
Full detail on item	get <id>

---

Memory Model

Category Weights

Categories affect search relevance and GC prioritization:

Category	Weight	Examples	GC Priority
decisions	10	"Chose PostgreSQL because...", "Architecture decision X"	Low (keep)
architecture	8	"Using Next.js + Prisma", "Service boundaries"	Low (keep)
blockers	7	"Waiting on API key", "Dependency conflict"	Medium
session	6	"Session completed: built auth", "Turn summary"	Medium
tasks	5	"BUILD complete: 142 tests pass"	Medium
conversation	4	Auto-generated conversation summaries	High
general	4	User-added notes	Medium
git-activity	3	Recent commits	High
ingested	2	Project file summaries	High
reference	1	Imported external docs	High (clean up)

---

CLI Commands

Primary CLI: scripts/mem0-v2.py

# ═══════════════════════════════════════════════════════════════
# SETUP
# ═══════════════════════════════════════════════════════════════

# First-time setup (creates database schema)
python3 scripts/mem0-v2.py setup

# ═══════════════════════════════════════════════════════════════
# STORING MEMORIES
# ═══════════════════════════════════════════════════════════════

# Add a memory with category
python3 scripts/mem0-v2.py add "Decided to use JWT + refresh tokens for auth" --category decisions

# Add with tags
python3 scripts/mem0-v2.py add "Migration from REST to GraphQL planned for Q2" --category architecture --tags graphql,rest,migration

# Add with custom ID for linking
python3 scripts/mem0-v2.py add "User authentication via Auth0" --category decisions --id auth-system-001

# Batch add from file
python3 scripts/mem0-v2.py add --batch memories.txt

# ═══════════════════════════════════════════════════════════════
# RETRIEVING MEMORIES (3 LAYERS)
# ═══════════════════════════════════════════════════════════════

# LAYER 1: Compact index (always first)
# ~15 tokens/result — quick overview
python3 scripts/mem0-v2.py index "project context" --limit 30

# LAYER 2: Full-text search (BM25 ranked)
# ~60 tokens/result — detailed matches
python3 scripts/mem0-v2.py search "authentication flow" --limit 5

# LAYER 3: Full detail on demand
# ~200 tokens/result — complete observation
python3 scripts/mem0-v2.py get 123

# ═══════════════════════════════════════════════════════════════
# LISTING & FILTERING
# ═══════════════════════════════════════════════════════════════

# List all memories (paginated)
python3 scripts/mem0-v2.py list --limit 50

# List by category
python3 scripts/mem0-v2.py list --category decisions --limit 20

# List by tag
python3 scripts/mem0-v2.py list --tag authentication --limit 10

# List recent
python3 scripts/mem0-v2.py list --recent 10

# ═══════════════════════════════════════════════════════════════
# STATISTICS & MAINTENANCE
# ═══════════════════════════════════════════════════════════════

# Memory statistics
python3 scripts/mem0-v2.py stats

# Garbage collection (value-weighted)
python3 scripts/mem0-v2.py gc --max-obs 200

# Clean old sessions
python3 scripts/mem0-v2.py gc --category session --older-than 7d

# Export memories
python3 scripts/mem0-v2.py export --format json > memories.json

# ═══════════════════════════════════════════════════════════════
# UTILITIES
# ═══════════════════════════════════════════════════════════════

# Search with JSON output (for scripting)
python3 scripts/mem0-v2.py search "auth" --format json

# Get memory count by category
python3 scripts/mem0-v2.py stats --by-category

# Find related memories (by shared tags or context)
python3 scripts/mem0-v2.py related 123 --limit 5

---

Python API

Quick Start

import sys
sys.path.insert(0, 'scripts')
from mem0_v2 import MemoryDB, get_db

# Initialize (singleton pattern)
db = get_db()

# ═══════════════════════════════════════════════════════════════
# STORING
# ═══════════════════════════════════════════════════════════════

# Add a memory
result = db.add(
    "Decided to use JWT for auth with 15min access token + 7d refresh token",
    category="decisions"
)
print(f"Created memory with ID: {result['id']}")

# Add with tags
result = db.add(
    "GraphQL migration planned for Q2 2024",
    category="architecture",
    tags=["graphql", "rest", "migration"]
)

# Add with custom ID
result = db.add(
    "Auth system chosen: Auth0",
    category="decisions",
    custom_id="auth-system-001"
)

# ═══════════════════════════════════════════════════════════════
# RETRIEVING
# ═══════════════════════════════════════════════════════════════

# Layer 1: Compact index (~15 tokens/result)
index = db.memory_index("forgewright project", limit=30)
for item in index["results"]:
    print(f"ID: {item['id']}, Preview: {item['preview']}")

# Layer 2: Full-text search (~60 tokens/result)
results = db.search("authentication", limit=5)
for result in results["results"]:
    print(f"ID: {result['id']}, Score: {result['score']}, Text: {result['text']}")

# Layer 3: Full detail (~200 tokens/result)
detail = db.memory_get(123)
print(f"Full text: {detail['text']}")
print(f"Metadata: {detail['metadata']}")

# ═══════════════════════════════════════════════════════════════
# LISTING
# ═══════════════════════════════════════════════════════════════

# List all with pagination
memories = db.list_all(category="decisions", limit=10, offset=0)

# List by tag
memories = db.list_all(tag="authentication", limit=10)

# Recent memories
memories = db.list_all(recent=20)

# ═══════════════════════════════════════════════════════════════
# MAINTENANCE
# ═══════════════════════════════════════════════════════════════

# Statistics
stats = db.stats()
print(f"Total memories: {stats['total']}")
print(f"By category: {stats['by_category']}")
print(f"Storage size: {stats['size_mb']}MB")

# Garbage collection
removed = db.gc(max_obs=200)
print(f"Removed {removed['count']} memories")

# Clean by category and age
removed = db.gc(category="session", older_than_days=7)
print(f"Removed {removed['count']} old session memories")

# ═══════════════════════════════════════════════════════════════
# UPDATING & DELETING
# ═══════════════════════════════════════════════════════════════

# Update a memory
db.update(123, text="Updated: Now using RS256 instead of HS256")

# Delete a memory
db.delete(123)

# Delete by category
db.delete(category="reference")

---

Token Optimization Strategy

Progressive Disclosure Layers

Layer	Method	Tokens/Result	Use Case
L1: Compact	index()	~15	Always first — quick overview
L2: Search	search()	~60	Top matches get detail
L3: Full	get()	~200	On-demand for specific items

Token Budget Management

# Maximum tokens per retrieval (configurable)
MAX_TOKENS = 500

# Retrieval strategy
def smart_retrieve(query: str, max_tokens: int = 500):
    # Step 1: Get compact index (~15 tokens/result)
    overview = db.memory_index(query, limit=30)

    # Step 2: If tokens allow, search for details (~60 tokens/result)
    tokens_used = len(overview["results"]) * 15
    remaining = max_tokens - tokens_used

    if remaining > 60:
        details_needed = remaining // 60
        results = db.search(query, limit=details_needed)
        return merge_results(overview, results)

    return overview

# Always cap at budget
def safe_retrieve(query: str, max_tokens: int = 500):
    results = []
    for layer in ['index', 'search', 'get']:
        if token_budget_exceeded(results, max_tokens):
            break
        layer_results = fetch_layer(layer, query)
        results.extend(layer_results)
    return results

When to Retrieve

Situation	Approach
Session start	Search project name + keywords, limit top-5
Before complex task	Search task keywords, limit top-3
At gate decisions	Fetch relevant decisions/blockers by category
After completing work	Store summary + decisions
On error	Store blocker with context

---

Safety Features

Automatic Secret Redaction

The CLI automatically redacts patterns matching:

Pattern Type	Examples
API Keys	sk-*, key-*, api_key, apikey
Tokens	Bearer *, token=*, jwt.*
Passwords	password=*, passwd=*
Secrets	secret=*, private_key, -----BEGIN RSA PRIVATE KEY-----
Connection Strings	postgres://user:pass@host
AWS Keys	AKIA*, aws_secret

# What gets redacted
input_text = "API key: sk-1234567890abcdef"
# Output: "API key: [REDACTED]"

# What stays
input_text = "User reported issue with login flow"
# Output: "User reported issue with login flow"

.memignore File

Create .memignore at project root to exclude files from ingestion:

# Patterns to exclude from memory ingestion
.env
*.log
node_modules/
dist/
build/
.git/
secrets/
credentials.json

Strict Compliance & Forced Enablement

Under the Forgewright Compliance Policy, memory is a non-negotiable hard constraint and cannot be disabled.

If any attempt is made to bypass or disable memory (using MEM0_DISABLED=true or FORGEWRIGHT_SKIP_MEM0=1), the system will automatically override the bypass flag to false, log an enforcement warning, and force-enable the full memory mechanism.

---

Configuration

Environment Variables

# Project namespace (auto-detected from git)
MEM0_PROJECT_ID=my-project

# Token limits
MEM0_MAX_TOKENS=500               # max tokens per retrieval
MEM0_MAX_OBS=200                  # max observations before GC

# Safety
MEM0_REDACT_SECRETS=true          # auto-redact API keys, passwords
MEM0_DISABLED=false                # set true to skip all ops

# Database location
MEM0_DB_PATH=.forgewright/memory.db

Project Config (mem0.yaml)

# mem0.yaml
project: my-project
database:
  path: .forgewright/memory.db
  wal_mode: true

retrieval:
  max_tokens: 500
  layers:
    index:
      tokens_per_result: 15
      default_limit: 30
    search:
      tokens_per_result: 60
      default_limit: 5
    full:
      tokens_per_result: 200
      default_limit: 3

gc:
  max_observations: 200
  category_weights:
    decisions: 10
    architecture: 8
    blockers: 7
    session: 6
    tasks: 5
    conversation: 4
    general: 4
    git-activity: 3
    ingested: 2
    reference: 1

redaction:
  enabled: true
  patterns:
    - api_key
    - password
    - token
    - secret
    - private_key

---

Integration with Forgewright Pipeline

Active Lifecycle Integration

# hooks/memory_hooks.py
class MemoryLifecycleHooks:
    """Hooks for automatic memory management"""

    def on_session_start(self, project: str, user_request: str):
        """Query relevant context before starting work"""
        db = get_db()
        context = db.search(f"{project} {user_request}", limit=5)
        return context

    def on_phase_complete(self, phase: str, summary: str):
        """Store phase completion"""
        db = get_db()
        db.add(
            f"Phase {phase} completed: {summary}",
            category="tasks",
            tags=[phase.lower()]
        )

    def on_gate_decision(self, gate: int, decision: str, feedback: str):
        """Store gate decisions"""
        db = get_db()
        db.add(
            f"Gate {gate} decision: {decision}. Feedback: {feedback}",
            category="decisions"
        )

    def on_error(self, task: str, error: str, context: dict):
        """Store blocker details"""
        db = get_db()
        db.add(
            f"BLOCKER: {task} failed: {error}",
            category="blockers",
            metadata=context
        )

    def on_session_end(self, summary: str, tasks_completed: list):
        """Store session summary"""
        db = get_db()
        db.add(
            f"Session completed: {summary}. Tasks: {', '.join(tasks_completed)}",
            category="session"
        )

Session Tracking

# Check session health
python3 scripts/mem0-v2.py list --category session --recent 5

# Get session summary
python3 scripts/mem0-v2.py search "session" --limit 3

---

File Layout

forgewright/
├── skills/memory-manager/
│   └── SKILL.md              ← this file
├── scripts/
│   ├── mem0-v2.py            ← PRIMARY CLI (SQLite + FTS5)
│   ├── mem0-cli.py           ← DEPRECATED (TF-IDF + JSONL)
│   ├── local_memory.py       ← DEPRECATED (ChromaDB + embeddings)
│   ├── migrate-chroma-to-sqlite.py  ← Migration helper
│   └── memory_session.sh     ← Shell helpers
└── .forgewright/
    ├── memory.db             ← PRIMARY storage (SQLite + FTS5)
    ├── memory.db-wal         ← WAL journal
    ├── memory.db-shm         ← Shared memory
    ├── memory.jsonl          ← Legacy storage (read-only, migrate then delete)
    ├── memory_db/            ← DEPRECATED ChromaDB storage
    └── project-profile.json  ← project fingerprint (committed)

---

Migration

From Old Systems

# Migrate from JSONL (mem0-cli.py)
python3 scripts/mem0-v2.py migrate

# Migrate from ChromaDB (local_memory.py)
python3 scripts/migrate-chroma-to-sqlite.py

# Verify migration
python3 scripts/mem0-v2.py stats

Migration Verification

# Check old system disabled
grep -r "mem0-cli\|local_memory" .

# Check new system active
python3 scripts/mem0-v2.py stats

# Compare counts
echo "Old (JSONL):" && wc -l .forgewright/memory.jsonl
echo "New (SQLite):" && python3 scripts/mem0-v2.py list --format json | jq length

---

Deprecated Systems

System	Status	Migration
mem0-cli.py	DEPRECATED	Migrate to mem0-v2.py
local_memory.py	DEPRECATED	Migrate to mem0-v2.py
ChromaDB storage	DEPRECATED	Migrate to SQLite

---

Advanced Features

RRF Fusion (Future)

Hybrid search combining multiple ranking signals:

# Example: Merge rankings from multiple sources
results = db.rrf_fusion(
    sources=[
        ("fts5_bm25", search_results),
        ("category_boost", weighted_results),
        ("recency", time_decayed_results)
    ],
    weights=[0.6, 0.3, 0.1]
)

Observation Links

Link related observations:

-- Related concepts
-- Contradicting decisions
-- Superseded approaches
-- Extended implementations

Session Tracking (Advanced)

# Sessions table for cross-session tracking
db.create_session(
    request_summary="Implement user authentication",
    completed_tasks=["auth-flow", "jwt-tokens"],
    next_steps=["add refresh tokens", "implement logout"],
    notes="Using Auth0, JWT with RS256"
)

# Get recent sessions
sessions = db.list_sessions(limit=5)
for session in sessions:
    print(f"{session['date']}: {session['request_summary']}")

---

Common Mistakes

Mistake	Fix
Not storing after tasks	Automate via lifecycle hooks. Store after every meaningful action.
Querying without budget	Always set --limit or max_tokens. Avoid unbounded retrieval.
Storing secrets	Memory auto-redacts, but avoid manually bypassing.
Ignoring GC	Old memories accumulate. Run GC periodically.
Using wrong category	Categories affect search relevance. Use consistently.
One-time import	Memory only works if populated continuously. Make it a habit.

---

Execution Checklist

• Setup completed (python3 scripts/mem0-v2.py setup)
• Old systems migrated (JSONL, ChromaDB)
• Lifecycle hooks integrated into orchestrator
• .memignore created if needed
• MEM0 environment variables configured
• First memory added (test the system)
• GC scheduled (weekly or bi-weekly)