migrate orion repo into monorepo structure

go/migrations/000004_particles.up.sql

@@ -0,0 +1,30 @@
+CREATE TYPE particle_type AS ENUM (
+  'stream', 'folder', 'media', 'file', 'text', 'quest', 'paper', 'think'
+);
+
+CREATE TYPE visibility_mode AS ENUM ('network_all', 'custom');
+
+CREATE TABLE particles (
+  id TEXT PRIMARY KEY,
+  type particle_type NOT NULL,
+  network_id TEXT NOT NULL REFERENCES networks(id) ON DELETE CASCADE,
+  parent_id TEXT REFERENCES particles(id) ON DELETE CASCADE,
+  created_by_email VARCHAR(255) NOT NULL,
+  visibility visibility_mode NOT NULL DEFAULT 'network_all',
+  data JSONB NOT NULL DEFAULT '{}',
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE particle_members (
+  particle_id TEXT NOT NULL REFERENCES particles(id) ON DELETE CASCADE,
+  email VARCHAR(255) NOT NULL,
+  added_at TIMESTAMPTZ DEFAULT NOW(),
+  PRIMARY KEY (particle_id, email)
+);
+
+-- Indexes
+CREATE INDEX idx_particles_parent_updated ON particles(parent_id, updated_at DESC);
+CREATE INDEX idx_particles_network_root ON particles(network_id, updated_at DESC) WHERE parent_id IS NULL;
+CREATE INDEX idx_particles_open_streams ON particles(network_id) WHERE type = 'stream' AND data->>'status' = 'open';
+CREATE INDEX idx_particle_members_email ON particle_members(email, particle_id);