diff --git a/db/db-init.sql b/db/db-init.sql
new file mode 100644
index 0000000..896bfe3
--- /dev/null
+++ b/db/db-init.sql
@@ -0,0 +1,5 @@
+INSERT INTO komp.space(name, model, dim) VALUES
+  ('dev_knowledge','mxbai-embed-large',1024),
+  ('pattern_exchange','mxbai-embed-large',1024),
+  ('runtime_memory','mxbai-embed-large',1024)
+ON CONFLICT (name) DO NOTHING;
diff --git a/db/schema.sql b/db/schema.sql
index 03dd9d8..ccdbe2f 100644
--- a/db/schema.sql
+++ b/db/schema.sql
@@ -1,43 +1,105 @@
--- Kompanion knowledge store (sqlite)
-PRAGMA journal_mode=WAL;
-PRAGMA synchronous=NORMAL;
+-- Requires: CREATE EXTENSION IF NOT EXISTS vector; CREATE EXTENSION IF NOT EXISTS ltree;
 
-CREATE TABLE IF NOT EXISTS entries (
-  id INTEGER PRIMARY KEY,
-  ts TEXT NOT NULL,
-  aspect TEXT,
-  tags TEXT,
-  text TEXT NOT NULL
+CREATE SCHEMA IF NOT EXISTS komp;
+CREATE EXTENSION IF NOT EXISTS vector;
+CREATE EXTENSION IF NOT EXISTS ltree;
+
+CREATE TABLE IF NOT EXISTS komp.source (
+  id         BIGSERIAL PRIMARY KEY,
+  kind       TEXT NOT NULL,       -- filesystem|repo|url|note
+  uri        TEXT NOT NULL,       -- path or URL
+  repo       TEXT,
+  ref        TEXT,
+  meta       JSONB DEFAULT '{}'::jsonb,
+  created_at TIMESTAMPTZ DEFAULT now()
 );
 
-CREATE VIRTUAL TABLE IF NOT EXISTS entries_fts USING fts5(text, content="entries", content_rowid="id");
-CREATE TRIGGER IF NOT EXISTS entries_ai AFTER INSERT ON entries BEGIN
-  INSERT INTO entries_fts(rowid, text) VALUES (new.id, new.text);
-END;
-CREATE TRIGGER IF NOT EXISTS entries_ad AFTER DELETE ON entries BEGIN
-  INSERT INTO entries_fts(entries_fts, rowid, text) VALUES(delete, old.id, old.text);
-END;
-CREATE TRIGGER IF NOT EXISTS entries_au AFTER UPDATE ON entries BEGIN
-  INSERT INTO entries_fts(entries_fts, rowid, text) VALUES(delete, old.id, old.text);
-  INSERT INTO entries_fts(rowid, text) VALUES (new.id, new.text);
-END;
+CREATE TABLE IF NOT EXISTS komp.chunk (
+  id         BIGSERIAL PRIMARY KEY,
+  source_id  BIGINT REFERENCES komp.source(id) ON DELETE CASCADE,
+  lineno     INT,
+  text       TEXT NOT NULL,
+  sha256     TEXT NOT NULL,
+  tokens     INT,
+  created_at TIMESTAMPTZ DEFAULT now()
+);
+CREATE INDEX IF NOT EXISTS idx_chunk_source ON komp.chunk(source_id);
 
-CREATE TABLE IF NOT EXISTS sources (
-  id INTEGER PRIMARY KEY,
-  file TEXT NOT NULL,
-  sha TEXT,
-  lineno INTEGER
+-- A space is a distinct memory with its own model+dim & policy
+CREATE TABLE IF NOT EXISTS komp.space (
+  id     SERIAL PRIMARY KEY,
+  name   TEXT UNIQUE,   -- dev_knowledge | pattern_exchange | runtime_memory
+  model  TEXT NOT NULL,
+  dim    INT  NOT NULL,
+  metric TEXT NOT NULL DEFAULT 'cosine'
 );
 
-CREATE TABLE IF NOT EXISTS vectors (
-  id INTEGER PRIMARY KEY,
-  entry_id INTEGER REFERENCES entries(id) ON DELETE CASCADE,
-  model TEXT NOT NULL,
-  dim INTEGER NOT NULL,
-  vec BLOB NOT NULL
+-- Embedding tables per common dimension (add more as needed)
+CREATE TABLE IF NOT EXISTS komp.embedding_768 (
+  id           BIGSERIAL PRIMARY KEY,
+  chunk_id     BIGINT REFERENCES komp.chunk(id) ON DELETE CASCADE,
+  space_id     INT REFERENCES komp.space(id) ON DELETE CASCADE,
+  embedding    VECTOR(768) NOT NULL,
+  created_at   TIMESTAMPTZ DEFAULT now(),
+  UNIQUE(chunk_id, space_id)
+);
+CREATE INDEX IF NOT EXISTS idx_embed768_space ON komp.embedding_768(space_id);
+CREATE INDEX IF NOT EXISTS ivf_embed768 ON komp.embedding_768 USING ivfflat (embedding vector_cosine_ops) WITH (lists=100);
+
+CREATE TABLE IF NOT EXISTS komp.embedding_1024 (
+  id           BIGSERIAL PRIMARY KEY,
+  chunk_id     BIGINT REFERENCES komp.chunk(id) ON DELETE CASCADE,
+  space_id     INT REFERENCES komp.space(id) ON DELETE CASCADE,
+  embedding    VECTOR(1024) NOT NULL,
+  created_at   TIMESTAMPTZ DEFAULT now(),
+  UNIQUE(chunk_id, space_id)
+);
+CREATE INDEX IF NOT EXISTS idx_embed1024_space ON komp.embedding_1024(space_id);
+CREATE INDEX IF NOT EXISTS ivf_embed1024 ON komp.embedding_1024 USING ivfflat (embedding vector_cosine_ops) WITH (lists=100);
+
+-- Branch hierarchy (Branch Embeddings): path encodes the cluster tree (e.g., physics.quantum.tunneling)
+CREATE TABLE IF NOT EXISTS komp.branch (
+  id       BIGSERIAL PRIMARY KEY,
+  space_id INT REFERENCES komp.space(id) ON DELETE CASCADE,
+  path     LTREE NOT NULL,
+  label    TEXT,
+  meta     JSONB DEFAULT '{}'::jsonb,
+  UNIQUE(space_id, path)
+);
+CREATE INDEX IF NOT EXISTS gist_branch_path ON komp.branch USING GIST (path);
+
+-- Centroids per dimension (store only the dim matching the space)
+CREATE TABLE IF NOT EXISTS komp.branch_centroid_768 (
+  branch_id  BIGINT PRIMARY KEY REFERENCES komp.branch(id) ON DELETE CASCADE,
+  embedding  VECTOR(768) NOT NULL,
+  updated_at TIMESTAMPTZ DEFAULT now()
+);
+CREATE TABLE IF NOT EXISTS komp.branch_centroid_1024 (
+  branch_id  BIGINT PRIMARY KEY REFERENCES komp.branch(id) ON DELETE CASCADE,
+  embedding  VECTOR(1024) NOT NULL,
+  updated_at TIMESTAMPTZ DEFAULT now()
 );
 
-CREATE TABLE IF NOT EXISTS ledger_head (
-  id INTEGER PRIMARY KEY CHECK (id=1),
-  head_sha TEXT
+-- Soft membership of chunks to branches
+CREATE TABLE IF NOT EXISTS komp.chunk_branch (
+  chunk_id  BIGINT REFERENCES komp.chunk(id) ON DELETE CASCADE,
+  branch_id BIGINT REFERENCES komp.branch(id) ON DELETE CASCADE,
+  weight    REAL NOT NULL CHECK (weight >= 0 AND weight <= 1),
+  PRIMARY KEY(chunk_id, branch_id)
 );
+
+-- Relations between chunks (similarity / cites / derives / contradicts / …)
+CREATE TABLE IF NOT EXISTS komp.chunk_edge (
+  src_chunk_id BIGINT REFERENCES komp.chunk(id) ON DELETE CASCADE,
+  dst_chunk_id BIGINT REFERENCES komp.chunk(id) ON DELETE CASCADE,
+  relation     TEXT NOT NULL,
+  weight       REAL,
+  meta         JSONB DEFAULT '{}'::jsonb,
+  PRIMARY KEY(src_chunk_id, dst_chunk_id, relation)
+);
+
+CREATE OR REPLACE VIEW komp.latest_sources AS
+  SELECT s.*, max(c.created_at) AS last_chunk_at
+  FROM komp.source s LEFT JOIN komp.chunk c ON c.source_id = s.id
+  GROUP BY s.id;
+