Postgram

Postgram keeps the data you and your agents work from in one inspectable place: notes, documents, tasks, people, projects, interactions, decisions, and agent memory. Humans use the browser UI and CLI; agents use the same corpus over MCP, REST, or the CLI.

It is more than an agent-memory layer. Postgram preserves typed source objects, supports GTD-style task management and Markdown folder sync, combines full-text and vector retrieval with a knowledge graph, and separates short-lived agent working context from durable memory.

<sub>Watch the demo</sub> </td> <td width="50%"> <img src="assets/search.png" alt="Postgram search interface showing ranked knowledge results" /> <sub>Search across memories, documents, people, projects, and tasks</sub> </td>

Why Postgram

• One private corpus across tools. Give different agents and devices access to the same data without tying it to one editor or hosted memory provider.
• Inspectable source data. Store typed entities instead of opaque chat summaries, then search, edit, link, archive, or delete them yourself.
• Search before graph expansion. Hybrid retrieval finds relevant entities; edge summaries tell an agent when related graph context is worth following.
• Working context is not durable memory. Session context has its own scope and lifecycle; grooming can archive it or distill selected context into durable memory.
• Operator control. Choose where PostgreSQL runs, which embedding and extraction providers are allowed, who receives API keys, and what is kept.

Postgram is built for one person or a small trusted team running a local or single-VM deployment. It is not a hosted service or a multi-tenant SaaS platform. Knowledge extraction is optional, and the provided Docker Compose setup binds the raw API and UI ports to loopback by default.

Quick Start (Docker Compose)

You need Git, Docker, and Docker Compose. Node.js 22+ is needed only for local development or for installing the pgm CLI; gpg is needed only for encrypted CLI backups.

1. Clone Postgram:

   git clone https://github.com/ivo-toby/postgram.git
   cd postgram
   

2. Choose an embedding path before the first start. For the local default, install and start Ollama on the Docker host, then pull Postgram's default embedding model:

   ollama pull bge-m3
   

   For hosted OpenAI embeddings instead, create a .env file containing a real key before starting Compose:

   OPENAI_API_KEY=<your-openai-key>
   

3. Start the stack:

   docker compose up -d --build
   

   The first run creates persistent Docker volumes for PostgreSQL and installation secrets. No .env file is required for the default Compose path.

4. Read the one-time bootstrap token:

   docker compose logs mcp-server \
     | grep 'Bootstrap token:' \
     | tail -n 1
   

   The plaintext appears only in the original first-start logs. Capture it before recreating the API container or discarding those logs.

5. Open http://127.0.0.1:3000/admin, paste the token, create the first admin, enroll MFA, and follow the onboarding flow.

6. Confirm the selected provider in the Admin Config tab. If you add or change staged settings, save, validate, and apply them, then restart mcp-server when Admin marks a restart as required:

   docker compose restart mcp-server
   

   When Ollama runs on the Docker host, its base URL is http://host.docker.internal:11434. Optional LLM relationship extraction is disabled by default and can use OpenAI, Anthropic, Ollama, or an OpenAI-compatible endpoint. Changing the embedding provider, model, or dimensions after the first start is migration work and is blocked from a simple config apply.

7. Check health, then create an API key in the Admin Overview tab. For the smoke test below, allow read and write, the memory entity type, and personal visibility:

   curl -fsS http://127.0.0.1:3100/health
   

   The response should include "status":"ok" and "postgres":"connected".

8. Install the CLI and verify an authenticated write and search. Enrichment is asynchronous, so wait for pgm queue to report no pending work before the search:

   npm install -g @ivotoby/postgram-cli
   export PGM_API_URL=http://127.0.0.1:3100
   export PGM_API_KEY='<plaintext-api-key>'
   
   pgm store "Postgram quick start is working" \
     --type memory \
     --visibility personal \
     --tags quickstart
   pgm queue
   pgm search "quick start"
   

If embeddings are unreachable, Postgram still starts and accepts writes, but enrichment and search will fail until the provider is available. See the full quick start and troubleshooting guide for the longer path.

For access from ChatGPT, Claude, or another remote MCP client, put Postgram behind HTTPS, enable OAuth, and follow the MCP integration guide. Do not publish the loopback development ports directly to the internet.

What It Does

Postgram provides:

• durable storage for typed entities: memory, person, project, task, interaction, document
• hybrid BM25 + vector search with asynchronous enrichment
• knowledge graph with typed directional edges between entities
• LLM-powered relationship extraction (OpenAI, Anthropic, or Ollama)
• document sync from local markdown repos via manifest comparison
• browser interfaces for knowledge work and guarded administration
• UMAP and PCA projections of embedded entities
• GTD-style capture, task organization, and Kanban views
• scoped API-key authentication and visibility restrictions
• a REST API for application and automation access
• a Streamable HTTP MCP endpoint for agent-native tool access
• a CLI (pgm) for humans and agents
• a container-local admin CLI (pgm-admin)
• Talon SQLite migration tooling
• encrypted backup support
• audit logging for mutating and privileged operations

How It Works

Postgram is a TypeScript Node.js application built around a service layer.

Main components:

• PostgreSQL + pgvector for persistence and vector search
• Hono for the HTTP server
• MCP over Streamable HTTP for agent-facing tool access
• CLI/admin CLIs built with Commander
• background enrichment worker for chunking, embeddings, and LLM extraction

High-level flow:

1. a client stores or updates an entity
2. the entity is written immediately
3. enrichment runs asynchronously: chunking, embedding, and optionally LLM extraction
4. chunks and embeddings are produced in the background
5. edges are created from extracted relationships (if extraction is enabled)
6. search queries use hybrid BM25 + vector scoring, with optional graph expansion

Main Features

1. Typed Knowledge Storage

Store structured knowledge objects with:

• type (memory, person, project, task, interaction, document)
• content
• tags
• visibility (personal, work, shared)
• status
• arbitrary JSON metadata

Memory Roles

Postgram supports two roles for memory entities:

• durable_memory: long-term memory future agents should trust, such as decisions, preferences, constraints, root causes, and completed-work summaries.
• session_context: working context for resuming recent conversations. Session context is scoped to the calling client, embedded for semantic recall, and skipped by graph extraction.

Use session context for "where were we in this thread?" Use durable memory for "what should future agents remember as true?"

CLI users can write session context with pgm memory session-context and search it with pgm search --memory-role session_context.

Operators can groom stale session context with pgm-admin memory groom. Use --client-id <client-id> for one client or --all-clients to batch over every session-context scope. --all-clients keeps each client scope separate; it is operational batching, not cross-client consolidation. --older-than <duration> defaults to 7d and accepts values like 30m, 4h, 7d, or 0d. --dry-run previews eligible memories without calling the LLM. Grooming has no default candidate cap; pass --limit <n> when you want to process a bounded batch. --mode archive --yes archives eligible working context directly. --mode promote --yes uses the configured extraction LLM to decide whether each session-context memory should be promoted; promoted memories are distilled into new durable_memory entities, the source context is archived, and provenance is recorded with metadata.promoted_to plus a promoted_to edge.

Authenticated users and agents can self-groom only their own client-scoped session context:

pgm memory groom --dry-run --older-than 7d
pgm memory groom --older-than 14d --topic postgram --tag session-context --yes

The normal CLI derives scope from PGM_API_KEY; it does not accept --client-id, --all-clients, or promotion mode. Archive requires --yes. Optional filters are --topic, --session-id, and repeatable --tag.

MCP clients can use the groom_session_context tool with the same self scope:

{
  "mode": "dry_run",
  "older_than": "7d",
  "topic": "postgram",
  "session_id": "optional-session-id",
  "tags": ["session-context"]
}

MCP mode is dry_run or archive; promotion remains admin-only.

For scheduled maintenance, run grooming from the host that has access to the Postgram container. This cron example assesses eligible session context for all client scopes every three days at 03:17 and appends JSON output to a log. The wrapper detects that cron does not provide a TTY and runs non-interactively:

17 3 */3 * * cd /path/to/postgram && ./bin/pgm-admin --json memory groom --all-clients --older-than 7d --mode promote --yes >> /var/log/postgram-memory-groom.log 2>&1

Use --mode archive --yes instead if you want to archive eligible working context without LLM-assisted promotion. Run the same command with --dry-run first to verify the eligible set.

Operators can also review durable memory quality without mutating the durable claim itself:

./bin/pgm-admin memory groom-durable --dry-run --older-than 30d
./bin/pgm-admin memory groom-durable --mode mark --yes --older-than 30d

Durable grooming selects active durable_memory rows, including legacy memory rows with no metadata.memory_role, and classifies them as keep, needs_grooming, archive, or superseded. Mark mode writes metadata.durable_grooming with the outcome, reason, review timestamp, and any LLM suggestions. It does not rewrite content, change status, archive rows, or merge duplicates.

To actually clean the marked rows, apply the grooming labels:

./bin/pgm-admin memory apply-durable-grooming --dry-run
./bin/pgm-admin memory apply-durable-grooming --yes

Apply mode defaults to auto: needs_grooming memories are rewritten from the stored suggestion or the configured extraction LLM, while archive and superseded memories are archived. Rewrites clear stale chunks and re-queue embedding enrichment. Use --mode rewrite or --mode archive, plus --status, --topic, --tag, --visibility, or --limit, to narrow the batch.

2. Async Enrichment

Entities with content are persisted first and enriched later. Each entity tracks enrichment_status: pending, completed, or failed. Failed entities are retried up to 3 times with a 5-minute backoff.

3. Hybrid Search

Search blends vector cosine similarity (60%) with BM25 keyword ranking (40%) transparently. Broad searches select candidates through the HNSW index; small filtered sets use exact distance ranking, and HNSW falls back to exact ranking when its candidate scan cannot fill its target. Search requires a reachable embedding provider; if that provider is unavailable, writes still succeed but enrichment and search fail until it recovers. Results include:

• ranked results with blended scores
• similarity scores
• recency-adjusted scores
• matching chunk text
• optional 1-hop graph neighbors (expand_graph parameter)

4. Knowledge Graph

Entities can be connected by typed directional edges:

• relation types: involves, assigned_to, part_of, blocked_by, mentioned_in, related_to, or any custom type
• edges have a confidence score (1.0 for manual, LLM-assigned for extracted)
• graph traversal via expand with configurable depth (1-3 hops)
• duplicate edge prevention via UNIQUE(source_id, target_id, relation)
• edges are created manually via link/unlink or automatically by the LLM extraction pipeline

5. LLM Extraction

When enabled, the enrichment worker extracts relationships from entity content using an LLM. Extracted entity names are matched against existing entities and edges are created automatically.

Supported providers:

Provider	Model default	Env vars required
OpenAI	gpt-4o-mini	OPENAI_API_KEY
Anthropic	claude-haiku-4-5-20251001	ANTHROPIC_API_KEY
Ollama	llama3.2	OLLAMA_BASE_URL (default: http://localhost:11434)

These are configuration defaults, not model-quality recommendations. Graph extraction is a constrained structured-output task; validate the resulting edges on your own corpus before running a large backfill, especially with small local models.

6. Document Sync

Sync local directories of markdown files into postgram:

pgm sync ~/Documents/personal-notes
pgm sync ~/Documents/cf-notes --repo cf-notes --quiet

The CLI walks the directory for .md files, computes SHA-256 hashes, and sends a full manifest to the server. The server diffs against stored state and creates, updates, or archives document entities. Supports --dry-run and cron scheduling.

7. Access Control

API keys can be restricted by:

• scopes: read, write, delete, sync
• allowed entity types
• allowed visibility levels

8. Task Management

Tasks are first-class entities with convenience operations for:

• create (with GTD context and due dates)
• list (filtered by status and context)
• update
• complete (with completion timestamp)

9. Multiple Interfaces

The same service layer is exposed through:

• REST API
• Streamable HTTP MCP endpoint
• pgm CLI
• pgm-admin CLI (./bin/pgm-admin)
• Browser extensions for Chrome and Firefox — one-click web clipper that captures the current page or text selection via the REST API. Build with npm run -w @ivotoby/postgram-browser-extension-chrome package (or the Firefox equivalent); install unpacked from the per-package README.

Repository Layout

src/
  auth/            API key validation and auth middleware
  cli/             CLI for humans/agents and admin CLI
  db/              Pool and migrations
  migrate-talon/   Talon import path
  services/        Business logic (entities, search, edges, sync, extraction)
  transport/       REST and MCP adapters
  types/           Shared types
  util/            Errors, audit, logging

ui/                User-facing web UI and Admin UI
cli/               Published @ivotoby/postgram-cli package
docker/            Container entrypoint and secret bootstrap scripts
bin/               Local operator wrappers

packages/
  browser-extension-chrome/   Chromium web clipper (MV3)
  browser-extension-firefox/  Firefox web clipper (MV3)

tests/
  contract/        REST and MCP contract tests
  integration/     Service and CLI integration tests
  unit/            Pure logic tests

Requirements

• Docker and Docker Compose for the recommended deployment
• Node.js 22+ for the pgm CLI or local development
• a reachable OpenAI or Ollama embedding provider for enrichment and search

Optional:

• OpenAI API key (for OpenAI embeddings or extraction)
• Anthropic API key (for LLM extraction)
• Ollama (for local embeddings or LLM extraction)
• gpg (for encrypted CLI backups)

Docker Setup Details

1. Start Docker Compose

docker compose up -d --build

The default Compose path does not require manual .env edits. On first run it creates a persistent postgram_secrets Docker volume containing:

• the Postgres password used by the app container
• ADMIN_MFA_SECRET_KEY for encrypted admin TOTP seeds
• ADMIN_SETTINGS_ENCRYPTION_KEY for DB-backed provider secrets

If an existing Docker install already has POSTGRES_PASSWORD in .env, the first start after this change copies that legacy password into postgram_secrets/postgres-password instead of generating a different database password. Keep the old .env value in place for that first upgraded start.

The API binds to 127.0.0.1:3100 and the UI binds to 127.0.0.1:3000 by default. Use POSTGRAM_API_PORT=<port> or UI_PORT=<port> as shell overrides when running more than one local stack.

To use an existing Postgres cluster with Compose, set POSTGRES_HOST, POSTGRES_PORT, POSTGRES_DB, and POSTGRES_USER on mcp-server in a Compose override and remove the postgres dependency, as in the operator examples. If that external cluster requires password auth, set POSTGRES_PASSWORD in .env; if it uses passwordless local auth, leave POSTGRES_PASSWORD= blank. You can also bypass the split settings entirely by setting DATABASE_URL.

For embeddings, Compose preserves the OpenAI default when OPENAI_API_KEY is present. If no OpenAI key and no explicit EMBEDDING_PROVIDER are supplied, the container entrypoint chooses local Ollama embeddings so a clean stack can boot before provider secrets are configured.

2. Complete first admin setup

On first start, the API container prints a clear one-time bootstrap banner with the token:

Postgram first admin setup
Bootstrap token: ...
Open http://127.0.0.1:3000/admin and paste this token.

If the console has scrolled, read the same one-time bootstrap token from the trusted local operator channel:

docker compose logs mcp-server | grep 'Bootstrap token:' | tail -n 1

Then open http://127.0.0.1:3000/admin, create the first admin user, and complete MFA enrollment. The bootstrap token is stored hash-only in Postgres, expires after 24 hours, and is invalidated after the first admin is created. If you changed the Postgres target, copy the latest bootstrap-token log line; older lines may belong to a previous database and will be rejected.

After active MFA login, the Admin dashboard opens a guided onboarding flow until it is completed or deliberately skipped. The guide explains the setup path in plain operator language:

• what bootstrap, admin login, and MFA confirmation protect
• how provider settings, embedding dimensions, extraction models, and write-only provider secrets fit together
• when to validate and apply saved provider configuration
• why backup/restore is staged before switch-over
• how maintenance dry-runs, re-extraction, re-embedding, and edge pruning work

Onboarding progress is stored server-side in Postgres. Refreshing the browser, closing the tab, logging out and back in, or restarting the Docker containers resumes at the latest saved step as long as the existing pgdata volume is preserved. The Onboarding tab remains available from the dashboard after skip or completion.

For local Docker testing, preserve the database volume:

docker compose up -d --build
docker compose restart mcp-server postgram-ui

Do not use docker compose down -v when testing onboarding resume behavior. That command removes named volumes, including the pgdata Postgres volume, and will reset the server-side onboarding state along with the database.

3. Check health

curl http://127.0.0.1:3100/health

Expected:

• status: "ok"
• postgres: "connected"

4. Configure providers and create API keys

Use the Admin dashboard in the browser for the supported happy path:

• Onboarding tab: resume, skip, or complete the Docker-first setup guide.
• Config tab: save provider settings and write-only provider secrets.
• Overview tab: create Postgram API keys, inspect health, queue, stats, config/model/job status, and audit rows.
• Maintenance tab: run safe dry-run previews and poll job status before any destructive apply.
• Backup tab: download a gzipped v2 archive containing a data-only PostgreSQL custom dump plus redacted runtime configuration. Restore is intentionally staged: the server rejects legacy v1/full-schema archives, accepts only approved Postgram table-data entries from pg_restore --list, creates the trusted schema from bundled migrations, and restores the accepted data into a new database name. Health checks run before operator-approved switch-over. If the restored database misbehaves, roll back by restoring the previous POSTGRES_DB or DATABASE_URL setting and restarting mcp-server/postgram-ui; the old database is left untouched for this emergency path.

Normal Docker setup and maintenance should not require pgm-admin after startup/bootstrap. The pgm-admin CLI remains documented below for emergency recovery, embedding migrations, raw SQL inspection, and advanced operator jobs.

Docker Secret Backup And Failure Behavior

Back up the postgram_secrets Docker volume separately from database backups. Database backups contain encrypted provider secrets and encrypted TOTP factors; they do not contain the installation keys needed to decrypt them.

Losing or replacing ADMIN_MFA_SECRET_KEY prevents existing TOTP factors from being verified. Losing or replacing ADMIN_SETTINGS_ENCRYPTION_KEY prevents stored provider secrets from being decrypted. With the wrong settings key, provider config reads remain redacted, provider apply/runtime secret use fails closed, and operators must restore the original key or re-save provider secrets after a deliberate rotation/recovery procedure.

For Docker Compose, missing secret files are generated only on an empty postgram_secrets volume. Invalid persisted secret files fail container startup before the server binds. Optional env overrides still work, but keep those values outside database backups and browser storage.

Environment Variables

Server

Variable	Required	Default	Description
DATABASE_URL	non-Compose	Docker secret file + Postgres env	Full Postgres connection string. Compose constructs it from the generated Postgres password secret when unset.
POSTGRES_HOST	no	postgres	Compose Postgres host used when DATABASE_URL is unset. Override to host.docker.internal or another hostname for an existing cluster.
POSTGRES_PORT	no	5432	Compose Postgres port used when DATABASE_URL is unset.
POSTGRES_DB	no	postgram	Compose Postgres database used when DATABASE_URL is unset.
POSTGRES_USER	no	postgram	Compose Postgres user used when DATABASE_URL is unset.
POSTGRES_PASSWORD	no	Docker secret file	Compose Postgres password used when DATABASE_URL is unset. For external hosts, an explicit blank value builds a passwordless URL.
ADMIN_MFA_SECRET_KEY	admin setup	Docker secret file	Stable 32+ character secret used to encrypt admin TOTP seeds. Compose generates and persists it in postgram_secrets when unset.
OPENAI_API_KEY	conditional		Required when EMBEDDING_PROVIDER=openai OR (EXTRACTION_ENABLED=true AND EXTRACTION_PROVIDER=openai). Optional otherwise.
ADMIN_SETTINGS_ENCRYPTION_KEY	when saving admin-managed secrets	Docker secret file	32-byte base64url installation key used to encrypt DB-backed provider secrets. Compose generates and persists it in postgram_secrets when unset. Keep it outside database backups.
PORT	no	3100	HTTP/MCP server port
POSTGRAM_API_PORT	no	3100	Docker Compose host port for the API/backend. The container listen port stays 3100.
UI_PORT	no	3000	Docker Compose host port for the UI.
OAUTH_ENABLED	no	false	Enable OAuth authorization-code, PKCE, and Dynamic Client Registration routes for native remote MCP connectors.
PUBLIC_BASE_URL	conditional		Public HTTPS origin for OAuth metadata and callback URLs. Required when OAUTH_ENABLED=true. Example: https://postgram.example.com.
LOG_LEVEL	no	info	pino log level
ENRICHMENT_POLL_INTERVAL_MS	no	1000	Enrichment worker poll interval

Embeddings

Variable	Required	Default	Description
EMBEDDING_PROVIDER	no	openai (Compose auto-selects)	openai or ollama. Compose keeps OpenAI when OPENAI_API_KEY is present, otherwise chooses Ollama unless explicitly set.
EMBEDDING_MODEL	no	per-provider	Defaults: text-embedding-3-small (openai, 1536 dims), bge-m3 (ollama, 1024 dims)
EMBEDDING_DIMENSIONS	no	per-provider	Must match the active embedding_models row. Run ./bin/pgm-admin embeddings migrate --target-dimensions <N> --yes to change.
EMBEDDING_BASE_URL	when provider=ollama	falls back to OLLAMA_BASE_URL	Embedding host. Independent from LLM-extraction host so embeddings and inference can target different machines.
EMBEDDING_API_KEY	no		Optional bearer token for EMBEDDING_BASE_URL.
EMBEDDING_TIMEOUT_MS	no	15000	Hard timeout for a single embedding provider call. Bounds how long one stalled call can delay a request.
QUERY_EMBEDDING_CACHE_SIZE	no	512	In-process query embeddings held in front of the Postgres-backed cache.
QUERY_EMBEDDING_CACHE_SECRET	no		Keys the query digest with an HMAC. Without it the digest is an unkeyed sha256, which a reader of the database can dictionary-test to confirm whether a guessed query was run. Set it if you treat query text as more sensitive than entity content; it must live outside the database to mean anything. Changing it invalidates existing cache rows.
QUERY_EMBEDDING_CACHE_RETENTION_DAYS	no	30	Age at which persisted query embeddings are pruned. The hourly prune also retains only the 2,000 newest entries per client.

When Postgram runs in Docker and Ollama runs directly on the Docker host, use http://host.docker.internal:11434 for EMBEDDING_BASE_URL; localhost inside the container points at the Postgram container, not the host machine.

See specs/002-local-embeddings/quickstart.md for a walkthrough of fresh-install-on-Ollama and migrating from OpenAI.

LLM Extraction

Variable	Required	Default	Description
EXTRACTION_ENABLED	no	false	Enable LLM relationship extraction
EXTRACTION_MEMORY_MODE	no	embed_only	Controls graph extraction for type=memory: embed_only keeps all memories searchable through embeddings without graph/entity extraction; extract_durable extracts only durable_memory; extract_all extracts both durable and session-context memories.
EXTRACTION_PROVIDER	no	openai	LLM provider: openai, anthropic, ollama, or openai-compatible
EXTRACTION_MODEL	no	per-provider	Model name (defaults: gpt-4o-mini for OpenAI, claude-haiku-4-5-20251001 for Anthropic, llama3.2 for Ollama, gpt-4o-mini for OpenAI-compatible)
EXTRACTION_BASE_URL	when provider=openai-compatible		Base URL for OpenAI-compatible chat-completions APIs, including any /v1 path. Postgram appends /chat/completions. Example: http://host.docker.internal:8000/v1.
EXTRACTION_API_KEY	no		Optional bearer token for EXTRACTION_BASE_URL.
EXTRACTION_AUTO_CREATE_ENTITIES	no	false	When true, extraction creates stub entities for referenced targets that don't yet exist (e.g. a person named in a document gets a person entity automatically). Tagged auto-created; metadata records the originating document.
EXTRACTION_AUTO_CREATE_TYPES	no	person,project,interaction	Comma-separated list of entity types eligible for auto-creation. document, task, memory are intentionally excluded from the default to keep those user-authored.
EXTRACTION_AUTO_CREATE_MIN_CONFIDENCE	no	0.7	Minimum per-extraction confidence (0–1) required to auto-create an entity. Raise to cut noise, lower for a denser graph.
ANTHROPIC_API_KEY	when provider=anthropic		Anthropic API key
OLLAMA_BASE_URL	no	http://localhost:11434	Ollama server URL
EXTRACTION_REASONING_EFFORT	no	unset	minimal | low | medium | high. Forwarded as reasoning_effort to OpenAI and Ollama for reasoning models (o-series, gpt-5, gpt-oss). When set, overrides the implicit minimal that EXTRACTION_DISABLE_THINKING=true sends to OpenAI.
LLM_REQUEST_TIMEOUT_MS	no	120000	Hard cap per LLM call in milliseconds. Bump this when running slow local models (e.g. gpt-oss:120b-cloud).
EXTRACTION_SEMANTIC_NEIGHBORS_ENABLED	no	false	Enable semantic neighbor linking (see below).
EXTRACTION_SEMANTIC_NEIGHBORS_MAX	no	10	Maximum number of neighbor edges to create per entity.
EXTRACTION_SEMANTIC_NEIGHBORS_MIN_SIMILARITY	no	0.65	Minimum cosine similarity (0–1) for an entity to qualify as a neighbor. Raise to reduce noise; lower if you're finding too few neighbors. The right value depends on your embedding model's similarity distribution — use ./bin/pgm-admin link-neighbors --all --dry-run to inspect actual scores before tuning.

Semantic neighbor linking: the LLM extraction pass only finds entities that are explicitly named in the source content. It misses entities that are thematically related but not cited by name — a weekly kickoff meeting about the same initiative, a wiki page covering the same strategy, a decision memo about the same project. When EXTRACTION_SEMANTIC_NEIGHBORS_ENABLED=true, a second pass runs after LLM extraction that queries the knowledge store for entities whose stored chunk embeddings are cosine-similar to the source entity's own embeddings, and links them with related_to. No extra LLM or embedding API calls are needed — the source entity's chunks are already stored by the enrichment step that runs before extraction. Edges created by this pass carry source = 'semantic-neighbor' so they are distinguishable from LLM-extracted edges. Entities already linked by the LLM pass are excluded to avoid a weaker related_to edge shadowing a stronger-typed edge for the same pair.

Backfilling and maintaining neighbor edges: the ./bin/pgm-admin link-neighbors command runs the semantic neighbor pass directly — no LLM calls, no extraction queue, just cosine similarity over stored chunks. Use it to backfill an existing graph or as a recurring maintenance job after new entities are added.

# Backfill all enriched entities (safe to re-run — edges are upserted).
./bin/pgm-admin link-neighbors --all

# Only documents:
./bin/pgm-admin link-neighbors --type document

# Single entity:
./bin/pgm-admin link-neighbors --id <uuid>

# Preview what would be linked and at what similarity — no edges created:
./bin/pgm-admin link-neighbors --id <uuid> --dry-run
./bin/pgm-admin link-neighbors --all --dry-run

# Tune the similarity threshold or edge cap:
./bin/pgm-admin link-neighbors --all --min-similarity 0.75 --max-neighbors 5

# Process in bounded batches (oldest-first):
./bin/pgm-admin link-neighbors --all --limit 500

Use --dry-run to inspect actual cosine similarity scores before committing edges — especially useful when tuning --min-similarity for a new embedding model. The output shows each entity and its candidate neighbors with their raw similarity scores.

If you also want to re-run LLM extraction at the same time (e.g. after enabling EXTRACTION_SEMANTIC_NEIGHBORS_ENABLED=true), use reextract instead — the worker runs both the LLM pass and the neighbor pass together:

./bin/pgm-admin reextract --all

Note: --clean-edges on reextract only removes edges with source='llm-extraction' — it does not touch semantic-neighbor edges. For a full clean slate:

DELETE FROM edges WHERE source = 'semantic-neighbor';

Scheduling as a recurring maintenance job: because link-neighbors is cheap (no LLM calls) and idempotent (edges are upserted, not duplicated), it works well as a weekly cron job that keeps the neighbor graph fresh as new entities are added. Example cron entry running every Sunday at 02:00:

0 2 * * 0 cd /path/to/postgram && ./bin/pgm-admin link-neighbors --all

Or with Docker Compose:

./bin/pgm-admin link-neighbors --all

Auto-created entities: when EXTRACTION_AUTO_CREATE_ENTITIES=true, entities that didn't exist before a document mentioned them are inserted with content = the extracted name, tags including auto-created, and metadata.auto_created_by = 'llm-extraction' plus metadata.source_entity_id pointing at the document that caused the creation. They enter the normal embedding queue so they become searchable, but they are deliberately excluded from the extraction queue — their only content is a bare name, so asking the LLM "what does Alice relate to?" with no context would just free-associate new stubs in a loop. To review or clean them up:

pgm list --tags auto-created --type person
# or wholesale prune:
docker compose exec postgres psql -U postgram -d postgram -c \
  "DELETE FROM entities WHERE 'auto-created' = ANY(tags);"

CLI

Variable	Required	Description
PGM_API_URL	yes	Server URL
PGM_API_KEY	yes	API key for authentication

Admin CLI

Variable	Required	Description
DATABASE_URL	yes	Direct DB connection for admin operations

Backup

Variable	Required	Description
DATABASE_URL or PGM_DATABASE_URL	yes	Database connection
PGM_BACKUP_PASSPHRASE	when using --encrypt	GPG encryption passphrase

Running The Server

Pre-built Docker image

Pull from GitHub Container Registry:

docker pull ghcr.io/ivo-toby/postgram:latest

Images are multi-arch (linux/amd64, linux/arm64). Tags available:

• latest — most recent build of main
• main — same as latest, explicit branch name
• sha-<short> — pinned to a specific commit

The docker-compose.yml in this repo builds locally by default; to use the pre-built image instead, replace build: . with image: ghcr.io/ivo-toby/postgram:latest for the mcp-server service.

Local development

npm run dev

Production-style local run:

npm run build
npm start

The server exposes:

• REST API at http://127.0.0.1:3100/api
• MCP endpoint at http://127.0.0.1:3100/mcp
• Health endpoint at http://127.0.0.1:3100/health

Authentication

Create an API key from the Admin dashboard at http://127.0.0.1:3000/admin. The plaintext key is displayed once in the browser and cannot be recovered after dismissal or reload.

Export it for CLI use:

export PGM_API_URL=http://127.0.0.1:3100
export PGM_API_KEY='<plaintext-key>'

REST API Overview

Entity endpoints

• POST /api/entities — store entity
• GET /api/entities/:id — recall entity
• PATCH /api/entities/:id — update entity
• DELETE /api/entities/:id — soft-delete entity
• GET /api/entities — list entities

Search

• POST /api/search — hybrid BM25+vector search (supports expand_graph and include_content)

REST search keeps full entity content by default for backwards compatibility. Pass include_content: false to return matched chunks without hydrating or serializing full result and graph-neighbor content. Other REST routes continue to return their existing full JSON responses. Compact JSON and TOON remain transport-layer conveniences for MCP and the CLI.

Tasks

• POST /api/tasks — create task
• GET /api/tasks — list tasks
• PATCH /api/tasks/:id — update task
• POST /api/tasks/:id/complete — complete task

Document sync

• POST /api/sync/diff — diff local manifest against server; returns paths to upload and delete
• POST /api/sync/upload — upload a batch of file contents
• POST /api/sync/finalize — archive orphans and restore stale matches
• POST /api/sync — single-shot push (retained for MCP and small syncs)
• GET /api/sync/status/:repo — get sync status

pgm sync uses the three-phase protocol (diff → batched upload → finalize) so large repos don't send a single oversized payload. Each upload batch is capped at ~50 files or ~4 MB, whichever comes first.

Knowledge graph

• POST /api/edges — create edge
• DELETE /api/edges/:id — delete edge
• GET /api/entities/:id/edges — list edges for entity
• GET /api/entities/:id/graph — expand graph neighborhood

Queue / enrichment

• GET /api/queue — enrichment + extraction queue status. Pass ?include_failures=true (optionally &failure_limit=N, default 20, max 100) to also receive the most recent failed entities with their error messages, e.g.:

  {
    "embedding": {
      "pending": 0,
      "completed": 120,
      "failed": 0,
      "retry_eligible": 0,
      "oldest_pending_secs": null
    },
    "extraction": { "pending": 2, "completed": 98, "failed": 3 },
    "failures": [
      {
        "id": "…",
        "type": "document",
        "kind": "extraction",
        "error": "llm context exceeded",
        "path": "notes/long.md",
        "updatedAt": "2026-04-22T10:12:33Z"
      }
    ]
  }
  

All /api/* routes require Authorization: Bearer <api-key>.

MCP Overview

MCP is served over Streamable HTTP at:

http://127.0.0.1:3100/mcp

Exposed tools:

• store, recall, search, update, delete, queue
• store_session_context, groom_session_context
• task_create, task_list, task_update, task_complete
• sync_push, sync_status
• link, unlink, expand

The MCP tool behavior is intentionally aligned with the REST surface, but token-heavy outputs default to compact agent-friendly responses:

• write acknowledgements (store, store_session_context, update, task writes, link) return compact ids/status/version instead of echoing full metadata and timestamps
• search, task_list, and expand return compact rows/graph payloads by default; compact search contains the matched chunk rather than full result or neighbor content and may include edges.count and edges.relations as cheap traversal affordances
• pass full_response: true to get the full REST-shaped payload, including complete entity content
• pass toon: true on list-like tools (search, task_list, expand) to receive compact TOON text from the MCP layer

Search is the discovery step: inspect compact IDs, scores, and matched chunks, then call recall only for the selected entities whose complete content is needed. Compact edges summaries contain counts and relation labels only. They do not include neighbor content. Use expand_graph or expand when the user needs causes, provenance, decisions, dependencies, blockers, ownership, involvement, discussion participants, connected context, or graph-based disambiguation. Avoid expansion for direct facts already present in the matched chunk.

The underlying API remains JSON; compacting and TOON happen only in MCP/CLI handlers.

Native Remote Connectors (ChatGPT and Claude)

Local MCP clients can connect with a static bearer API key. ChatGPT accounts with custom-connector/developer-mode access and Claude's Connectors UI can connect to a public Postgram endpoint through OAuth, without storing a static API-key header in the client settings:

OAUTH_ENABLED=true
PUBLIC_BASE_URL=https://postgram.example.com

Add ${PUBLIC_BASE_URL}/mcp as the connector URL in ChatGPT or Claude. The client discovers /.well-known/oauth-protected-resource/mcp, registers through /oauth/register, opens /oauth/authorize, and receives OAuth tokens from /oauth/token. The endpoint must be reachable over public HTTPS.

The authorize page asks for an existing Postgram API key once. Tokens issued from that approval inherit the API key's scopes, client_id, allowed entity types, and allowed visibility. If the source API key is revoked, OAuth access and refresh tokens derived from it stop working. Existing Authorization: Bearer <api-key> clients and /mcp?apiKey=... keep working unchanged.

CLI (pgm)

Install from npm

npm install -g @ivotoby/postgram-cli

Then configure once:

export PGM_API_URL=http://<postgram-host>:3100
export PGM_API_KEY=<your-api-key>
# or persist them in ~/.pgmrc as JSON: { "api_url": "...", "api_key": "..." }

Run from source (for development)

From the repo root, invoke the TypeScript entrypoint directly — no build step needed, and it picks up local changes immediately:

npx tsx cli/src/pgm.ts <command>
# e.g.
npx tsx cli/src/pgm.ts sync ~/Documents/personal-notes --repo personal-notes

Entity commands

pgm store "decided to use pgvector" --type memory --tags decisions
pgm search "database decisions"
pgm search "database decisions" --type memory          #