MVP stage 2: dedup (atom_relations) + compositions (telegram channel)

db/schema.sql

@@ -98,3 +98,20 @@ CREATE TABLE runs (
 -- Индексы
 CREATE INDEX ON jobs (status, scheduled_at);
 CREATE INDEX ON runs (stage, created_at DESC);
+
+-- Связи между атомами (дедup + lineage)
+CREATE TABLE atom_relations (
+  id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  atom_id_a       UUID REFERENCES atoms(id) ON DELETE CASCADE,
+  atom_id_b       UUID REFERENCES atoms(id) ON DELETE CASCADE,
+  relation_type   TEXT NOT NULL,   -- duplicate | related | superset | contradiction | parent_of
+  similarity      NUMERIC(4,3),    -- cosine similarity (0-1)
+  shared_topics   TEXT[] DEFAULT '{}',
+  confidence      NUMERIC(3,2),
+  source          TEXT,            -- semantic | lexical | manual
+  created_at      TIMESTAMPTZ DEFAULT now(),
+  UNIQUE (atom_id_a, atom_id_b, relation_type)
+);
+CREATE INDEX ON atom_relations (atom_id_a, relation_type);
+CREATE INDEX ON atom_relations (atom_id_b, relation_type);
+CREATE INDEX ON atom_relations (similarity DESC);