diff --git a/topology_api/migrations/001_extensions.sql b/topology_api/migrations/001_extensions.sql
index 20e062c..ddb0dfa 100644
--- a/topology_api/migrations/001_extensions.sql
+++ b/topology_api/migrations/001_extensions.sql
@@ -1,8 +1,14 @@
 -- topology_api/migrations/001_extensions.sql
 -- Create schema and required PostgreSQL extensions
+-- Extensions are installed in both public and topology schemas
+-- so types like citext resolve without schema prefix
 
 CREATE SCHEMA IF NOT EXISTS topology;
 
+CREATE EXTENSION IF NOT EXISTS pgcrypto WITH SCHEMA public;
+CREATE EXTENSION IF NOT EXISTS citext WITH SCHEMA public;
+CREATE EXTENSION IF NOT EXISTS btree_gist WITH SCHEMA public;
+
 CREATE EXTENSION IF NOT EXISTS pgcrypto WITH SCHEMA topology;
 CREATE EXTENSION IF NOT EXISTS citext WITH SCHEMA topology;
 CREATE EXTENSION IF NOT EXISTS btree_gist WITH SCHEMA topology;
diff --git a/topology_api/migrations/002_tables.sql b/topology_api/migrations/002_tables.sql
new file mode 100644
index 0000000..08420d9
--- /dev/null
+++ b/topology_api/migrations/002_tables.sql
@@ -0,0 +1,149 @@
+-- topology_api/migrations/002_tables.sql
+-- 8 core tables with temporal constraints
+
+-- 1. bases
+CREATE TABLE topology.bases (
+    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    code text NOT NULL,
+    name text NOT NULL,
+    description text,
+    created_at timestamptz NOT NULL DEFAULT now(),
+    updated_at timestamptz NOT NULL DEFAULT now(),
+    CONSTRAINT uq_bases_code UNIQUE (code)
+);
+
+-- 2. missions
+CREATE TABLE topology.missions (
+    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    base_id uuid NOT NULL REFERENCES topology.bases(id),
+    code citext NOT NULL,
+    title text NOT NULL,
+    occurrence_status text NOT NULL DEFAULT 'occurred'
+        CHECK (occurrence_status IN ('occurred', 'planned')),
+    description text,
+    source_ref text,
+    created_at timestamptz NOT NULL DEFAULT now(),
+    updated_at timestamptz NOT NULL DEFAULT now(),
+    CONSTRAINT uq_missions_base_code UNIQUE (base_id, code)
+);
+
+-- 3. mission_events
+CREATE TABLE topology.mission_events (
+    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    mission_id uuid NOT NULL REFERENCES topology.missions(id),
+    effective_at timestamptz NOT NULL,
+    event_order integer NOT NULL DEFAULT 0,
+    event_type text NOT NULL,
+    title text NOT NULL,
+    details jsonb,
+    source_ref text,
+    recorded_at timestamptz NOT NULL DEFAULT now(),
+    CONSTRAINT uq_mission_event_time UNIQUE (mission_id, effective_at, event_order)
+);
+
+-- 4. components
+CREATE TABLE topology.components (
+    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    base_id uuid NOT NULL REFERENCES topology.bases(id),
+    component_key text NOT NULL,
+    component_type text NOT NULL
+        CHECK (component_type IN ('module', 'node', 'vehicle', 'equipment')),
+    introduced_by_event_id uuid NOT NULL REFERENCES topology.mission_events(id),
+    retired_by_event_id uuid REFERENCES topology.mission_events(id),
+    metadata jsonb,
+    created_at timestamptz NOT NULL DEFAULT now(),
+    updated_at timestamptz NOT NULL DEFAULT now(),
+    CONSTRAINT uq_components_base_key UNIQUE (base_id, component_key)
+);
+
+-- 5. component_versions
+CREATE TABLE topology.component_versions (
+    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    component_id uuid NOT NULL REFERENCES topology.components(id),
+    display_name text NOT NULL,
+    summary text,
+    description text,
+    length_m numeric(10,3),
+    width_m numeric(10,3),
+    height_m numeric(10,3),
+    diameter_m numeric(10,3),
+    mass_t numeric(12,3),
+    detail_url text,
+    properties jsonb,
+    valid_from timestamptz NOT NULL,
+    valid_to timestamptz,
+    started_by_event_id uuid NOT NULL REFERENCES topology.mission_events(id),
+    ended_by_event_id uuid REFERENCES topology.mission_events(id),
+    valid_period tstzrange GENERATED ALWAYS AS (
+        tstzrange(valid_from, valid_to, '[)')
+    ) STORED,
+    created_at timestamptz NOT NULL DEFAULT now(),
+    updated_at timestamptz NOT NULL DEFAULT now(),
+    CONSTRAINT ck_version_valid_range CHECK (valid_from < valid_to OR valid_to IS NULL)
+);
+
+-- 6. component_states
+CREATE TABLE topology.component_states (
+    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    component_id uuid NOT NULL REFERENCES topology.components(id),
+    state_kind text NOT NULL,
+    state_value text NOT NULL,
+    details jsonb,
+    valid_from timestamptz NOT NULL,
+    valid_to timestamptz,
+    started_by_event_id uuid NOT NULL REFERENCES topology.mission_events(id),
+    ended_by_event_id uuid REFERENCES topology.mission_events(id),
+    valid_period tstzrange GENERATED ALWAYS AS (
+        tstzrange(valid_from, valid_to, '[)')
+    ) STORED,
+    created_at timestamptz NOT NULL DEFAULT now(),
+    updated_at timestamptz NOT NULL DEFAULT now(),
+    CONSTRAINT ck_state_valid_range CHECK (valid_from < valid_to OR valid_to IS NULL)
+);
+
+-- 7. ports
+CREATE TABLE topology.ports (
+    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    component_id uuid NOT NULL REFERENCES topology.components(id),
+    port_key text NOT NULL,
+    display_name text NOT NULL,
+    direction text,
+    interface_type text NOT NULL DEFAULT 'structural',
+    properties jsonb,
+    created_at timestamptz NOT NULL DEFAULT now(),
+    CONSTRAINT uq_ports_component_key UNIQUE (component_id, port_key)
+);
+
+-- 8. topology_connections
+CREATE TABLE topology.topology_connections (
+    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    base_id uuid NOT NULL REFERENCES topology.bases(id),
+    port_a_id uuid NOT NULL REFERENCES topology.ports(id),
+    port_b_id uuid NOT NULL REFERENCES topology.ports(id),
+    connection_type text NOT NULL
+        CHECK (connection_type IN (
+            'structural_mount', 'pressurized_passage', 'docking',
+            'power', 'fuel', 'cooling'
+        )),
+    properties jsonb,
+    valid_from timestamptz NOT NULL,
+    valid_to timestamptz,
+    established_by_event_id uuid NOT NULL REFERENCES topology.mission_events(id),
+    ended_by_event_id uuid REFERENCES topology.mission_events(id),
+    valid_period tstzrange GENERATED ALWAYS AS (
+        tstzrange(valid_from, valid_to, '[)')
+    ) STORED,
+    created_at timestamptz NOT NULL DEFAULT now(),
+    updated_at timestamptz NOT NULL DEFAULT now(),
+    CONSTRAINT ck_connection_valid_range CHECK (valid_from < valid_to OR valid_to IS NULL),
+    CONSTRAINT ck_different_ports CHECK (port_a_id <> port_b_id)
+);
+
+-- Temporal exclusion constraints
+ALTER TABLE topology.component_versions
+    ADD CONSTRAINT ex_version_no_overlap
+    EXCLUDE USING gist (component_id WITH =, valid_period WITH &&);
+
+ALTER TABLE topology.component_states
+    ADD CONSTRAINT ex_state_no_overlap
+    EXCLUDE USING gist (component_id WITH =, state_kind WITH =, valid_period WITH &&);
diff --git a/topology_api/migrations/003_indexes.sql b/topology_api/migrations/003_indexes.sql
new file mode 100644
index 0000000..c12a381
--- /dev/null
+++ b/topology_api/migrations/003_indexes.sql
@@ -0,0 +1,38 @@
+-- topology_api/migrations/003_indexes.sql
+-- Performance indexes for snapshot queries
+
+-- missions lookup
+CREATE INDEX IF NOT EXISTS idx_missions_base_status
+    ON topology.missions(base_id, occurrence_status);
+
+-- events time ordering
+CREATE INDEX IF NOT EXISTS idx_events_mission_time
+    ON topology.mission_events(mission_id, effective_at DESC, event_order DESC);
+CREATE INDEX IF NOT EXISTS idx_events_effective_time
+    ON topology.mission_events(effective_at DESC);
+
+-- components lookup
+CREATE INDEX IF NOT EXISTS idx_components_base
+    ON topology.components(base_id);
+
+-- versions time range
+CREATE INDEX IF NOT EXISTS idx_versions_component_time
+    ON topology.component_versions(component_id, valid_from DESC);
+CREATE INDEX IF NOT EXISTS idx_versions_current
+    ON topology.component_versions(component_id) WHERE valid_to IS NULL;
+
+-- states time range
+CREATE INDEX IF NOT EXISTS idx_states_component_kind_time
+    ON topology.component_states(component_id, state_kind, valid_from DESC);
+CREATE INDEX IF NOT EXISTS idx_states_current
+    ON topology.component_states(component_id, state_kind) WHERE valid_to IS NULL;
+
+-- connections time range
+CREATE INDEX IF NOT EXISTS idx_connections_base_time
+    ON topology.topology_connections(base_id, valid_from DESC);
+CREATE INDEX IF NOT EXISTS idx_connections_current
+    ON topology.topology_connections(base_id) WHERE valid_to IS NULL;
+
+-- ports
+CREATE INDEX IF NOT EXISTS idx_ports_component
+    ON topology.ports(component_id);